diff --git a/doc/starlight/astro.config.mjs b/doc/starlight/astro.config.mjs
index 2fa18aaace..4b4bc65ad2 100644
--- a/doc/starlight/astro.config.mjs
+++ b/doc/starlight/astro.config.mjs
@@ -99,7 +99,7 @@ export default defineConfig({
           items: ["misc/how_to_doc"],
         },
       ],
-      customCss: [],
+      customCss: ["./src/styles/custom.css", "./src/fonts/font-face.css"],
       logo: {
         src: "./src/assets/riot-logo.svg",
         replacesTitle: true,
@@ -110,4 +110,11 @@ export default defineConfig({
       },
     }),
   ],
+  vite: {
+    server: {
+      fs: {
+        allow: ["./", "../doxygen"],
+      },
+    },
+  },
 });
diff --git a/doc/starlight/src/fonts/font-face.css b/doc/starlight/src/fonts/font-face.css
new file mode 100644
index 0000000000..8680401c08
--- /dev/null
+++ b/doc/starlight/src/fonts/font-face.css
@@ -0,0 +1,11 @@
+@font-face {
+  font-family: "Miso";
+  src: url("../../../doxygen/src/fonts/miso.eot");
+  src: url("../../../doxygen/src/fonts/miso.eot?#iefix")
+      format("embedded-opentype"),
+    url("../../../doxygen/src/fonts/miso.woff") format("woff"),
+    url("../../../doxygen/src/fonts/miso.ttf") format("truetype"),
+    url("../../../doxygen/src/fonts/miso.svg#Miso") format("svg");
+  font-weight: normal;
+  font-style: normal;
+}
diff --git a/doc/starlight/src/styles/custom.css b/doc/starlight/src/styles/custom.css
new file mode 100644
index 0000000000..8e9aadf1c1
--- /dev/null
+++ b/doc/starlight/src/styles/custom.css
@@ -0,0 +1,68 @@
+/* Dark mode colors. */
+:root {
+  --sl-color-accent-low: #002c1c;
+  --sl-color-accent: #007d57;
+  --sl-color-accent-high: #91dbb8;
+  --sl-color-white: #ffffff;
+  --sl-color-gray-1: #eeeeee;
+  --sl-color-gray-2: #c2c2c2;
+  --sl-color-gray-3: #8b8b8b;
+  --sl-color-gray-4: #585858;
+  --sl-color-gray-5: #383838;
+  --sl-color-gray-6: #272727;
+  --sl-color-black: #181818;
+}
+/* Light mode colors. */
+:root[data-theme="light"] {
+  --sl-color-accent-low: #afe5ca;
+  --sl-color-accent: #007651;
+  --sl-color-accent-high: #003d28;
+  --sl-color-white: #181818;
+  --sl-color-gray-1: #272727;
+  --sl-color-gray-2: #383838;
+  --sl-color-gray-3: #585858;
+  --sl-color-gray-4: #8b8b8b;
+  --sl-color-gray-5: #c2c2c2;
+  --sl-color-gray-6: #eeeeee;
+  --sl-color-gray-7: #f6f6f6;
+  --sl-color-black: #ffffff;
+}
+
+main {
+  --font-scale: 1.53;
+
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    --sl-line-height-headings: 1;
+    font-weight: 500 !important;
+    font-family: "Miso", "Helvetica Neue", Helvetica, Arial, sans-serif;
+  }
+
+  h1 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h1)) !important;
+  }
+
+  h2 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h2)) !important;
+  }
+
+  h3 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h3)) !important;
+  }
+
+  h4 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h4)) !important;
+  }
+
+  h5 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h5)) !important;
+  }
+
+  h6 {
+    font-size: calc(var(--font-scale) * var(--sl-text-h6)) !important;
+  }
+}