diff --git a/_config.yml b/_config.yml
index 885a892..ec4b7f9 100644
--- a/_config.yml
+++ b/_config.yml
@@ -548,6 +548,12 @@ third_party_libraries:
     url:
       js: "https://cdn.jsdelivr.net/npm/photoswipe@{{version}}/dist/photoswipe-lightbox.esm.min.js"
     version: "5.4.4"
+  plotly:
+    integrity:
+      js: "sha256-oy6Be7Eh6eiQFs5M7oXuPxxm9qbJXEtTpfSI93dW16Q="
+    url:
+      js: "https://cdn.jsdelivr.net/npm/plotly.js@{{version}}/dist/plotly.min.js"
+    version: "3.0.1"
   polyfill:
     url:
       js: "https://cdnjs.cloudflare.com/polyfill/v{{version}}/polyfill.min.js?features=es6"
diff --git a/_includes/distill_scripts.liquid b/_includes/distill_scripts.liquid
index df4104c..8d6a63c 100644
--- a/_includes/distill_scripts.liquid
+++ b/_includes/distill_scripts.liquid
@@ -81,6 +81,17 @@
   <script defer src="{{ '/assets/js/echarts-setup.js' | relative_url | bust_file_cache }}" type="text/javascript"></script>
 {% endif %}
 
+{% if page.chart and page.chart.plotly %}
+  <!-- Plotly -->
+  <script
+    defer
+    src="{{ site.third_party_libraries.plotly.url.js }}"
+    integrity="{{ site.third_party_libraries.plotly.integrity.js }}"
+    crossorigin="anonymous"
+  ></script>
+  <script defer src="{{ '/assets/js/plotly-setup.js' | relative_url | bust_file_cache }}" type="text/javascript"></script>
+{% endif %}
+
 {% if page.chart and page.chart.vega_lite %}
   <!-- Vega -->
   <script
diff --git a/_includes/scripts.liquid b/_includes/scripts.liquid
index 402eafd..a97abaa 100644
--- a/_includes/scripts.liquid
+++ b/_includes/scripts.liquid
@@ -98,6 +98,17 @@
   <script defer src="{{ '/assets/js/echarts-setup.js' | relative_url | bust_file_cache }}" type="text/javascript"></script>
 {% endif %}
 
+{% if page.chart and page.chart.plotly %}
+  <!-- Plotly -->
+  <script
+    defer
+    src="{{ site.third_party_libraries.plotly.url.js }}"
+    integrity="{{ site.third_party_libraries.plotly.integrity.js }}"
+    crossorigin="anonymous"
+  ></script>
+  <script defer src="{{ '/assets/js/plotly-setup.js' | relative_url | bust_file_cache }}" type="text/javascript"></script>
+{% endif %}
+
 {% if page.chart and page.chart.vega_lite %}
   <!-- Vega -->
   <script
diff --git a/_posts/2025-03-26-plotly.md b/_posts/2025-03-26-plotly.md
new file mode 100644
index 0000000..0762d1f
--- /dev/null
+++ b/_posts/2025-03-26-plotly.md
@@ -0,0 +1,110 @@
+---
+layout: post
+title: a post with plotly.js
+date: 2025-03-26 14:24:00
+description: this is what included plotly.js code could look like
+tags: formatting charts
+categories: sample-posts
+chart:
+  plotly: true
+---
+
+This is an example post with some [plotly](https://plotly.com/javascript/) code.
+
+````markdown
+```plotly
+{
+  "data": [
+    {
+      "x": [1, 2, 3, 4],
+      "y": [10, 15, 13, 17],
+      "type": "scatter"
+    },
+    {
+      "x": [1, 2, 3, 4],
+      "y": [16, 5, 11, 9],
+      "type": "scatter"
+    }
+  ]
+}
+```
+````
+
+Which generates:
+
+```plotly
+{
+  "data": [
+    {
+      "x": [1, 2, 3, 4],
+      "y": [10, 15, 13, 17],
+      "type": "scatter"
+    },
+    {
+      "x": [1, 2, 3, 4],
+      "y": [16, 5, 11, 9],
+      "type": "scatter"
+    }
+  ]
+}
+```
+
+Also another example chart.
+
+````markdown
+```plotly
+{
+  "data": [
+    {
+      "x": [1, 2, 3, 4],
+      "y": [10, 15, 13, 17],
+      "mode": "markers"
+    },
+    {
+      "x": [2, 3, 4, 5],
+      "y": [16, 5, 11, 9],
+      "mode": "lines"
+    },
+    {
+      "x": [1, 2, 3, 4],
+      "y": [12, 9, 15, 12],
+      "mode": "lines+markers"
+    }
+  ],
+  "layout": {
+    "title": {
+      "text": "Line and Scatter Plot"
+    }
+  }
+}
+```
+````
+
+This is how it looks like:
+
+```plotly
+{
+  "data": [
+    {
+      "x": [1, 2, 3, 4],
+      "y": [10, 15, 13, 17],
+      "mode": "markers"
+    },
+    {
+      "x": [2, 3, 4, 5],
+      "y": [16, 5, 11, 9],
+      "mode": "lines"
+    },
+    {
+      "x": [1, 2, 3, 4],
+      "y": [12, 9, 15, 12],
+      "mode": "lines+markers"
+    }
+  ],
+  "layout": {
+    "title": {
+      "text": "Line and Scatter Plot"
+    }
+  }
+}
+```
diff --git a/assets/js/copy_code.js b/assets/js/copy_code.js
index cf0e1da..c2f78ed 100644
--- a/assets/js/copy_code.js
+++ b/assets/js/copy_code.js
@@ -8,6 +8,7 @@ codeBlocks.forEach(function (codeBlock) {
     codeBlock.querySelector("code:not(.language-echarts)") &&
     codeBlock.querySelector("code:not(.language-geojson)") &&
     codeBlock.querySelector("code:not(.language-mermaid)") &&
+    codeBlock.querySelector("code:not(.language-plotly)") &&
     codeBlock.querySelector("code:not(.language-vega_lite)")
   ) {
     // create copy button
diff --git a/assets/js/plotly-setup.js b/assets/js/plotly-setup.js
new file mode 100644
index 0000000..a6c21f6
--- /dev/null
+++ b/assets/js/plotly-setup.js
@@ -0,0 +1,52 @@
+let plotlyTheme = determineComputedTheme();
+/* Create plotly chart as another node and hide the code block, appending the plotly node after it
+       this is done to enable retrieving the code again when changing theme between light/dark */
+document.addEventListener("readystatechange", () => {
+  if (document.readyState === "complete") {
+    document.querySelectorAll("pre>code.language-plotly").forEach((elem) => {
+      const jsonCode = elem.textContent;
+      const backup = elem.parentElement;
+      backup.classList.add("unloaded");
+      /* create plotly node */
+      let chartElement = document.createElement("div");
+      backup.after(chartElement);
+
+      /* create plotly */
+      var jsonData = JSON.parse(jsonCode);
+
+      if (plotlyTheme === "dark") {
+        // dark theme extracted from https://github.com/plotly/plotly.py/blob/main/plotly/package_data/templates/plotly_dark.json?raw=true
+        // prettier-ignore
+        const plotlyDarkLayout = {"layout":{"autotypenumbers":"strict","colorway":["#636efa","#EF553B","#00cc96","#ab63fa","#FFA15A","#19d3f3","#FF6692","#B6E880","#FF97FF","#FECB52"],"font":{"color":"#f2f5fa"},"hovermode":"closest","hoverlabel":{"align":"left"},"paper_bgcolor":"rgb(17,17,17)","plot_bgcolor":"rgb(17,17,17)","polar":{"bgcolor":"rgb(17,17,17)","angularaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"radialaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"ternary":{"bgcolor":"rgb(17,17,17)","aaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"baxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"caxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"coloraxis":{"colorbar":{"outlinewidth":0,"ticks":""}},"colorscale":{"sequential":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"sequentialminus":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"diverging":[[0,"#8e0152"],[0.1,"#c51b7d"],[0.2,"#de77ae"],[0.3,"#f1b6da"],[0.4,"#fde0ef"],[0.5,"#f7f7f7"],[0.6,"#e6f5d0"],[0.7,"#b8e186"],[0.8,"#7fbc41"],[0.9,"#4d9221"],[1,"#276419"]]},"xaxis":{"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","automargin":true,"zerolinewidth":2},"yaxis":{"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","automargin":true,"zerolinewidth":2},"scene":{"xaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2},"yaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2},"zaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2}},"shapedefaults":{"line":{"color":"#f2f5fa"}},"annotationdefaults":{"arrowcolor":"#f2f5fa","arrowhead":0,"arrowwidth":1},"geo":{"bgcolor":"rgb(17,17,17)","landcolor":"rgb(17,17,17)","subunitcolor":"#506784","showland":true,"showlakes":true,"lakecolor":"rgb(17,17,17)"},"title":{"x":0.05},"updatemenudefaults":{"bgcolor":"#506784","borderwidth":0},"sliderdefaults":{"bgcolor":"#C8D4E3","borderwidth":1,"bordercolor":"rgb(17,17,17)","tickwidth":0},"mapbox":{"style":"dark"}},"data":{"histogram2dcontour":[{"type":"histogram2dcontour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"choropleth":[{"type":"choropleth","colorbar":{"outlinewidth":0,"ticks":""}}],"histogram2d":[{"type":"histogram2d","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"heatmap":[{"type":"heatmap","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"contourcarpet":[{"type":"contourcarpet","colorbar":{"outlinewidth":0,"ticks":""}}],"contour":[{"type":"contour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"surface":[{"type":"surface","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"mesh3d":[{"type":"mesh3d","colorbar":{"outlinewidth":0,"ticks":""}}],"scatter":[{"marker":{"line":{"color":"#283442"}},"type":"scatter"}],"parc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+
+        // if jsonData.layout exists, then update the theme
+        if (jsonData.layout) {
+          if (jsonData.layout.template) {
+            jsonData.layout.template = { ...plotlyDarkLayout, ...jsonData.layout.template };
+          } else {
+            jsonData.layout.template = plotlyDarkLayout;
+          }
+        } else {
+          jsonData.layout = { template: plotlyDarkLayout };
+        }
+      } else {
+        // light theme extracted from https://github.com/plotly/plotly.py/blob/main/plotly/package_data/templates/plotly_white.json?raw=true
+        // prettier-ignore
+        const plotlyLightLayout = {"layout":{"autotypenumbers":"strict","colorway":["#636efa","#EF553B","#00cc96","#ab63fa","#FFA15A","#19d3f3","#FF6692","#B6E880","#FF97FF","#FECB52"],"font":{"color":"#2a3f5f"},"hovermode":"closest","hoverlabel":{"align":"left"},"paper_bgcolor":"white","plot_bgcolor":"white","polar":{"bgcolor":"white","angularaxis":{"gridcolor":"#EBF0F8","linecolor":"#EBF0F8","ticks":""},"radialaxis":{"gridcolor":"#EBF0F8","linecolor":"#EBF0F8","ticks":""}},"ternary":{"bgcolor":"white","aaxis":{"gridcolor":"#DFE8F3","linecolor":"#A2B1C6","ticks":""},"baxis":{"gridcolor":"#DFE8F3","linecolor":"#A2B1C6","ticks":""},"caxis":{"gridcolor":"#DFE8F3","linecolor":"#A2B1C6","ticks":""}},"coloraxis":{"colorbar":{"outlinewidth":0,"ticks":""}},"colorscale":{"sequential":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"sequentialminus":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"diverging":[[0,"#8e0152"],[0.1,"#c51b7d"],[0.2,"#de77ae"],[0.3,"#f1b6da"],[0.4,"#fde0ef"],[0.5,"#f7f7f7"],[0.6,"#e6f5d0"],[0.7,"#b8e186"],[0.8,"#7fbc41"],[0.9,"#4d9221"],[1,"#276419"]]},"xaxis":{"gridcolor":"#EBF0F8","linecolor":"#EBF0F8","ticks":"","title":{"standoff":15},"zerolinecolor":"#EBF0F8","automargin":true,"zerolinewidth":2},"yaxis":{"gridcolor":"#EBF0F8","linecolor":"#EBF0F8","ticks":"","title":{"standoff":15},"zerolinecolor":"#EBF0F8","automargin":true,"zerolinewidth":2},"scene":{"xaxis":{"backgroundcolor":"white","gridcolor":"#DFE8F3","linecolor":"#EBF0F8","showbackground":true,"ticks":"","zerolinecolor":"#EBF0F8","gridwidth":2},"yaxis":{"backgroundcolor":"white","gridcolor":"#DFE8F3","linecolor":"#EBF0F8","showbackground":true,"ticks":"","zerolinecolor":"#EBF0F8","gridwidth":2},"zaxis":{"backgroundcolor":"white","gridcolor":"#DFE8F3","linecolor":"#EBF0F8","showbackground":true,"ticks":"","zerolinecolor":"#EBF0F8","gridwidth":2}},"shapedefaults":{"line":{"color":"#2a3f5f"}},"annotationdefaults":{"arrowcolor":"#2a3f5f","arrowhead":0,"arrowwidth":1},"geo":{"bgcolor":"white","landcolor":"white","subunitcolor":"#C8D4E3","showland":true,"showlakes":true,"lakecolor":"white"},"title":{"x":0.05},"mapbox":{"style":"light"}},"data":{"histogram2dcontour":[{"type":"histogram2dcontour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"choropleth":[{"type":"choropleth","colorbar":{"outlinewidth":0,"ticks":""}}],"histogram2d":[{"type":"histogram2d","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"heatmap":[{"type":"heatmap","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"contourcarpet":[{"type":"contourcarpet","colorbar":{"outlinewidth":0,"ticks":""}}],"contour":[{"type":"contour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"surface":[{"type":"surface","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"mesh3d":[{"type":"mesh3d","colorbar":{"outlinewidth":0,"ticks":""}}],"scatter":[{"fillpattern":{"fillmode":"overlay","size":10,"solidity":0.2},"type":"scatter"}],"parcoords":[{"type":"parcoords","line":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scatterpolargl":[{"type":"scatterpolargl","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"bar":[{"error_x":{"color":"#2a3f5f"},"error_y":{"color":"#2a3f5f"},"marker":{"line":{"color":"white","width":0.5},"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"bar"}],"scattergeo":[{"type":"scattergeo","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scatterpolar":[{"type":"scatterpolar","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"histogram":[{"marker":{"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"histogram"}],"scattergl":[{"type":"scattergl","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scatter3d":[{"type":"scatter3d","line":{"colorbar":{"outlinewidth":0,"ticks":""}},"marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scattermap":[{"type":"scattermap","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scattermapbox":[{"type":"scattermapbox","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scatterternary":[{"type":"scatterternary","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"scattercarpet":[{"type":"scattercarpet","marker":{"colorbar":{"outlinewidth":0,"ticks":""}}}],"carpet":[{"aaxis":{"endlinecolor":"#2a3f5f","gridcolor":"#C8D4E3","linecolor":"#C8D4E3","minorgridcolor":"#C8D4E3","startlinecolor":"#2a3f5f"},"baxis":{"endlinecolor":"#2a3f5f","gridcolor":"#C8D4E3","linecolor":"#C8D4E3","minorgridcolor":"#C8D4E3","startlinecolor":"#2a3f5f"},"type":"carpet"}],"table":[{"cells":{"fill":{"color":"#EBF0F8"},"line":{"color":"white"}},"header":{"fill":{"color":"#C8D4E3"},"line":{"color":"white"}},"type":"table"}],"barpolar":[{"marker":{"line":{"color":"white","width":0.5},"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"barpolar"}],"pie":[{"automargin":true,"type":"pie"}]}};
+
+        // if jsonData.layout exists, then update the theme
+        if (jsonData.layout) {
+          if (jsonData.layout.template) {
+            jsonData.layout.template = { ...plotlyLightLayout, ...jsonData.layout.template };
+          } else {
+            jsonData.layout.template = plotlyLightLayout;
+          }
+        } else {
+          jsonData.layout = { template: plotlyLightLayout };
+        }
+      }
+
+      Plotly.react(chartElement, jsonData.data, jsonData.layout);
+    });
+  }
+});
diff --git a/assets/js/theme.js b/assets/js/theme.js
index 9fa1db7..35f3a04 100644
--- a/assets/js/theme.js
+++ b/assets/js/theme.js
@@ -45,6 +45,11 @@ let applyTheme = () => {
     setEchartsTheme(theme);
   }
 
+  // if Plotly is not defined, do nothing
+  if (typeof Plotly !== "undefined") {
+    setPlotlyTheme(theme);
+  }
+
   // if vegaEmbed is not defined, do nothing
   if (typeof vegaEmbed !== "undefined") {
     setVegaLiteTheme(theme);
@@ -174,6 +179,47 @@ let setEchartsTheme = (theme) => {
   });
 };
 
+let setPlotlyTheme = (theme) => {
+  document.querySelectorAll(".js-plotly-plot").forEach((elem) => {
+    // Get the code block content from previous element, since it is the plotly code itself as defined in Markdown, but it is hidden
+    let jsonData = JSON.parse(elem.previousSibling.childNodes[0].innerHTML);
+
+    if (theme === "dark") {
+      // dark theme extracted from https://github.com/plotly/plotly.py/blob/main/plotly/package_data/templates/plotly_dark.json?raw=true
+      // prettier-ignore
+      const plotlyDarkLayout = {"layout":{"autotypenumbers":"strict","colorway":["#636efa","#EF553B","#00cc96","#ab63fa","#FFA15A","#19d3f3","#FF6692","#B6E880","#FF97FF","#FECB52"],"font":{"color":"#f2f5fa"},"hovermode":"closest","hoverlabel":{"align":"left"},"paper_bgcolor":"rgb(17,17,17)","plot_bgcolor":"rgb(17,17,17)","polar":{"bgcolor":"rgb(17,17,17)","angularaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"radialaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"ternary":{"bgcolor":"rgb(17,17,17)","aaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"baxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"caxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"coloraxis":{"colorbar":{"outlinewidth":0,"ticks":""}},"colorscale":{"sequential":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"sequentialminus":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"diverging":[[0,"#8e0152"],[0.1,"#c51b7d"],[0.2,"#de77ae"],[0.3,"#f1b6da"],[0.4,"#fde0ef"],[0.5,"#f7f7f7"],[0.6,"#e6f5d0"],[0.7,"#b8e186"],[0.8,"#7fbc41"],[0.9,"#4d9221"],[1,"#276419"]]},"xaxis":{"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","automargin":true,"zerolinewidth":2},"yaxis":{"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","automargin":true,"zerolinewidth":2},"scene":{"xaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2},"yaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2},"zaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3","gridwidth":2}},"shapedefaults":{"line":{"color":"#f2f5fa"}},"annotationdefaults":{"arrowcolor":"#f2f5fa","arrowhead":0,"arrowwidth":1},"geo":{"bgcolor":"rgb(17,17,17)","landcolor":"rgb(17,17,17)","subunitcolor":"#506784","showland":true,"showlakes":true,"lakecolor":"rgb(17,17,17)"},"title":{"x":0.05},"updatemenudefaults":{"bgcolor":"#506784","borderwidth":0},"sliderdefaults":{"bgcolor":"#C8D4E3","borderwidth":1,"bordercolor":"rgb(17,17,17)","tickwidth":0},"mapbox":{"style":"dark"}},"data":{"histogram2dcontour":[{"type":"histogram2dcontour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"choropleth":[{"type":"choropleth","colorbar":{"outlinewidth":0,"ticks":""}}],"histogram2d":[{"type":"histogram2d","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"heatmap":[{"type":"heatmap","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"contourcarpet":[{"type":"contourcarpet","colorbar":{"outlinewidth":0,"ticks":""}}],"contour":[{"type":"contour","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"surface":[{"type":"surface","colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]}],"mesh3d":[{"type":"mesh3d","colorbar":{"outlinewidth":0,"ticks":""}}],"scatter":[{"marker":{"line":{"color":"#283442"}},"type":"scatter"}],"parc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+
+      // if jsonData.layout exists, then update the theme
+      if (jsonData.layout) {
+        if (jsonData.layout.template) {
+          jsonData.layout.template = { ...plotlyDarkLayout, ...jsonData.layout.template };
+        } else {
+          jsonData.layout.template = plotlyDarkLayout;
+        }
+      } else {
+        jsonData.layout = { template: plotlyDarkLayout };
+      }
+    } else {
+      // light theme extracted from https://github.com/plotly/plotly.py/blob/main/plotly/package_data/templates/plotly_white.json?raw=true
+      // prettier-ignore
+      const plotlyLightLayout = 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+
+      // if jsonData.layout exists, then update the theme
+      if (jsonData.layout) {
+        if (jsonData.layout.template) {
+          jsonData.layout.template = { ...plotlyLightLayout, ...jsonData.layout.template };
+        } else {
+          jsonData.layout.template = plotlyLightLayout;
+        }
+      } else {
+        jsonData.layout = { template: plotlyLightLayout };
+      }
+    }
+
+    Plotly.relayout(elem, jsonData.layout);
+  });
+};
+
 let setVegaLiteTheme = (theme) => {
   document.querySelectorAll(".vega-lite").forEach((elem) => {
     // Get the code block content from previous element, since it is the vega lite code itself as defined in Markdown, but it is hidden