diff --git a/assets/css/style.css b/assets/css/style.css
index 7df0fb6..a12b283 100644
--- a/assets/css/style.css
+++ b/assets/css/style.css
@@ -1,187 +1,95 @@
-:root {
-  /* Use a shade of the c3cat logos pink, which works nicely as a link color. */
-  --accent-color-light: #DC049B;
-  /* A modified version of accent-color-light, which works nicely as a link color
-   * and with the dark theme */
-  --accent-color-dark: #dc49b0;
-}
+@layer base, per-site;
 
-body {
-  font-family: system-ui,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,Helvetica,Arial,"Helvetica Neue",sans-serif;
-
-  text-align: left;
-  line-height: 1.4;
-
-  /* Use dark grey instead of black to be lighter on the eyes. But also a grey
-   * which still works with the link color nicely. */
-  --bg-color: #ffffff;
-  --fg-color: #2b2b2b;
-  --accent-color: var(--accent-color-light);
-  background-color: var(--bg-color);
-  color: var(--fg-color);
-
-  @media (prefers-color-scheme: dark) {
-    /* Colors for dark theme, which have enough contrast, but also aren't too harsh on the eyes. */
-    /* See: https://seirdy.one/posts/2020/11/23/website-best-practices/#dark-themes */
-    --bg-color: #1b1b1b;
-    --fg-color: #ebebeb;
-    --accent-color: var(--accent-color-dark);
-  }
-}
-
-.container {
-  max-width: 600px;
-  margin: 0 auto;
-  padding: 0 5px;
-}
-
-footer {
-  margin-top: 4rem;
-}
-
-img {
-  width: 100%;
-}
-
-
-a:link, a:visited {
-  color: var(--accent-color);
-}
-
-u {
-  text-decoration-color: var(--accent-color);
-}
-
-.title {
-  text-align: center;
-}
-
-.hero-img {
-  max-width: 500px;
-  display: block;
-  margin: 0 auto;
-}
-
-p.bigger {
-  font-size: 1.2rem;
-}
-
-section {
-  margin-top: 3rem;
-}
-
-details {
-  border: 1px solid var(--accent-color);
-  border-radius: 8px;
-  background-color: color-mix(in hsl, var(--accent-color) 20%, var(--bg-color) 80%);
-
-  & > * {
-    padding: 0.5rem 1ch;
+@layer base {
+  :root {
+    /* Use a shade of the c3cat logos pink, which works nicely as a link color. */
+    --accent-color-light: #DC049B;
+    /* A modified version of accent-color-light, which works nicely as a link color
+     * and with the dark theme */
+    --accent-color-dark: #dc49b0;
   }
 
-  & > summary {
-    cursor: pointer;
-    user-select: none;
-  }
+  body {
+    font-family: system-ui,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,Helvetica,Arial,"Helvetica Neue",sans-serif;
 
-  &[open] > summary {
-    border-bottom: 1px solid var(--accent-color);
-    margin-left: 0;
-    margin-right: 0;
-  }
-}
+    text-align: left;
+    line-height: 1.4;
 
-ol.step-by-step-instructions {
-  margin-top: 1rem;
+    /* Use dark grey instead of black to be lighter on the eyes. But also a grey
+     * which still works with the link color nicely. */
+    --bg-color: #ffffff;
+    --fg-color: #2b2b2b;
+    --accent-color: var(--accent-color-light);
+    background-color: var(--bg-color);
+    color: var(--fg-color);
 
-  li {
-    margin-top: 0.5rem;
-    margin-bottom: 1rem;
-
-    &::marker {
-      color: color-mix(in hsl, var(--accent-color) 50%, var(--fg-color) 50%);
-      font-size: larger;
-    }
-
-    &>div {
-      display: flex;
-      flex-direction: row;
-      gap: 1ch;
-      justify-content: space-between;
-    }
-
-    input[type="checkbox"] {
-      margin: 4px;
-      width: 2rem;
-      height: 2rem;
-      flex-shrink: 0;
-      flex-grow: 0;
+    @media (prefers-color-scheme: dark) {
+      /* Colors for dark theme, which have enough contrast, but also aren't too harsh on the eyes. */
+      /* See: https://seirdy.one/posts/2020/11/23/website-best-practices/#dark-themes */
+      --bg-color: #1b1b1b;
+      --fg-color: #ebebeb;
+      --accent-color: var(--accent-color-dark);
     }
   }
-}
 
-dl.key-value {
-  display: grid;
-  grid-template-columns: 2ch [keys] fit-content(30ch) [values] auto;
-  column-gap: 2ch;
-  row-gap: 0.2rem;
+  .container {
+    max-width: 600px;
+    margin: 0 auto;
+    padding: 0 5px;
+  }
 
-  &>dt {
-    text-decoration-line: underline;
+  footer {
+    margin-top: 4rem;
+  }
+
+  img {
+    width: 100%;
+  }
+
+  a:link, a:visited {
+    color: var(--accent-color);
+  }
+
+  u {
     text-decoration-color: var(--accent-color);
-    grid-column-start: keys;
-    text-align: end;
   }
-  &>dd {
-    margin-left: 0;
-    grid-column-start: values;
-    &::before {
-      content: "➡";
-      margin-right: 2ch;
-      color: color-mix(in hsl, var(--bg-color) 30%, var(--fg-color) 70%);
+
+  .title {
+    text-align: center;
+  }
+
+  .hero-img {
+    max-width: 500px;
+    display: block;
+    margin: 0 auto;
+  }
+
+  p.bigger {
+    font-size: 1.2rem;
+  }
+
+  section {
+    margin-top: 3rem;
+  }
+
+  details {
+    border: 1px solid var(--accent-color);
+    border-radius: 8px;
+    background-color: color-mix(in hsl, var(--accent-color) 20%, var(--bg-color) 80%);
+
+    & > * {
+      padding: 0.5rem 1ch;
+    }
+
+    & > summary {
+      cursor: pointer;
+      user-select: none;
+    }
+
+    &[open] > summary {
+      border-bottom: 1px solid var(--accent-color);
+      margin-left: 0;
+      margin-right: 0;
     }
   }
 }
-
-fieldset#detail-grade-picker {
-  border-color: color-mix(in hsl, var(--accent-color) 50%, var(--fg-color) 50%);
-  display: flex;
-  align-items: baseline;
-
-  label {
-    flex-grow: 1;
-    margin-left: 0.5ch;
-  }
-
-  input,label {
-    cursor: pointer;
-  }
-
-  /* input[type="radio"]:checked+label {
-    text-decoration-line: underline;
-    text-decoration-color: var(--accent-color);
-  } */
-}
-
-
-/* hide items with .detail-default-hide if the corresponding .detail-show-(all|simplified|short) is not currently active */
-body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="all"]:checked)) .detail-default-hide.detail-show-all {
-  display: none;
-}
-body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="simplified"]:checked)) .detail-default-hide.detail-show-simplified {
-  display: none;
-}
-body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="short"]:checked)) .detail-default-hide.detail-show-short {
-  display: none;
-}
-
-/* hide items with .detail-hide-(all|simplified|short) if the corresponding radio button is active */
-body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="all"]:checked) .detail-hide-all {
-  display: none;
-}
-body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="simplified"]:checked) .detail-hide-simplified {
-  display: none;
-}
-body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="short"]:checked) .detail-hide-short {
-  display: none;
-}
diff --git a/index.html b/index.html
index baa4778..bd4735b 100644
--- a/index.html
+++ b/index.html
@@ -10,31 +10,33 @@
     <style>
       /* site-specific styles */
 
-      .resources-container {
-        display: flex;
-        flex-wrap: wrap;
-        column-gap: 1ch;
-        row-gap: 1rem;
-        justify-content: space-around;
-        align-items: stretch;
-        padding-left: 0;
+      @layer per-site {
+        .resources-container {
+          display: flex;
+          flex-wrap: wrap;
+          column-gap: 1ch;
+          row-gap: 1rem;
+          justify-content: space-around;
+          align-items: stretch;
+          padding-left: 0;
 
-        &>a {
-          display: block;
-          width: fit-content;
-          flex-basis: 45%;
-          border: 1px solid var(--accent-color);
-          padding: 8px;
-          text-decoration: unset;
-          color: var(--fg-color);
-          background-color: color-mix(in hsl, var(--bg-color) 90%, var(--fg-color) 10%);
-          min-height: 2rem;
-          text-align: center;
-          font-size: larger;
+          &>a {
+            display: block;
+            width: fit-content;
+            flex-basis: 45%;
+            border: 1px solid var(--accent-color);
+            padding: 8px;
+            text-decoration: unset;
+            color: var(--fg-color);
+            background-color: color-mix(in hsl, var(--bg-color) 90%, var(--fg-color) 10%);
+            min-height: 2rem;
+            text-align: center;
+            font-size: larger;
 
-          &:hover {
-            background-color: color-mix(in hsl, var(--bg-color) 80%, var(--fg-color) 20%);
-            box-shadow: 4px 4px 6px var(--accent-color);
+            &:hover {
+              background-color: color-mix(in hsl, var(--bg-color) 80%, var(--fg-color) 20%);
+              box-shadow: 4px 4px 6px var(--accent-color);
+            }
           }
         }
       }
diff --git a/rgb-ears-39c3.html b/rgb-ears-39c3.html
index 6a45051..cb1b662 100755
--- a/rgb-ears-39c3.html
+++ b/rgb-ears-39c3.html
@@ -5,6 +5,105 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" href="assets/css/style.css" />
     <title>c3cat</title>
+
+    <style>
+    @layer per-site {
+      ol.step-by-step-instructions {
+        margin-top: 1rem;
+
+        li {
+          margin-top: 0.5rem;
+          margin-bottom: 1rem;
+
+          &::marker {
+            color: color-mix(in hsl, var(--accent-color) 50%, var(--fg-color) 50%);
+            font-size: larger;
+          }
+
+          &>div {
+            display: flex;
+            flex-direction: row;
+            gap: 1ch;
+            justify-content: space-between;
+          }
+
+          input[type="checkbox"] {
+            margin: 4px;
+            width: 2rem;
+            height: 2rem;
+            flex-shrink: 0;
+            flex-grow: 0;
+          }
+        }
+      }
+
+      dl.key-value {
+        display: grid;
+        grid-template-columns: 2ch [keys] fit-content(30ch) [values] auto;
+        column-gap: 2ch;
+        row-gap: 0.2rem;
+
+        &>dt {
+          text-decoration-line: underline;
+          text-decoration-color: var(--accent-color);
+          grid-column-start: keys;
+          text-align: end;
+        }
+        &>dd {
+          margin-left: 0;
+          grid-column-start: values;
+          &::before {
+            content: "➡";
+            margin-right: 2ch;
+            color: color-mix(in hsl, var(--bg-color) 30%, var(--fg-color) 70%);
+          }
+        }
+      }
+
+      fieldset#detail-grade-picker {
+        border-color: color-mix(in hsl, var(--accent-color) 50%, var(--fg-color) 50%);
+        display: flex;
+        align-items: baseline;
+
+        label {
+          flex-grow: 1;
+          margin-left: 0.5ch;
+        }
+
+        input,label {
+          cursor: pointer;
+        }
+
+        /* input[type="radio"]:checked+label {
+          text-decoration-line: underline;
+          text-decoration-color: var(--accent-color);
+        } */
+      }
+
+
+      /* hide items with .detail-default-hide if the corresponding .detail-show-(all|simplified|short) is not currently active */
+      body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="all"]:checked)) .detail-default-hide.detail-show-all {
+        display: none;
+      }
+      body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="simplified"]:checked)) .detail-default-hide.detail-show-simplified {
+        display: none;
+      }
+      body:not(:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="short"]:checked)) .detail-default-hide.detail-show-short {
+        display: none;
+      }
+
+      /* hide items with .detail-hide-(all|simplified|short) if the corresponding radio button is active */
+      body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="all"]:checked) .detail-hide-all {
+        display: none;
+      }
+      body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="simplified"]:checked) .detail-hide-simplified {
+        display: none;
+      }
+      body:has(#detail-grade-picker input[type="radio"][name="detail-grade-picker"][value="short"]:checked) .detail-hide-short {
+        display: none;
+      }
+    }
+    </style>
   </head>
   <body class="container">
     <main>
@@ -18,7 +117,7 @@
       <section id="introduction">
         <fieldset id="detail-grade-picker">
           <legend>Choose the grade of details you want this guide to appear in</legend>
-          <input type="radio" id="detail-picker-all" name="detail-grade-picker" value="all">
+          <input type="radio" id="detail-picker-all" name="detail-grade-picker" value="all" checked>
           <label for="detail-picker-all">Show everything</label>
 
           <input type="radio" id="detail-picker-simplified" name="detail-grade-picker" value="simplified">