diff --git a/code/services-application/search-service/resources/static/search/serp.scss b/code/services-application/search-service/resources/static/search/serp.scss
index 089c3884..7152f662 100644
--- a/code/services-application/search-service/resources/static/search/serp.scss
+++ b/code/services-application/search-service/resources/static/search/serp.scss
@@ -1,33 +1,87 @@
-$nicotine-dark: #acae89;
-$nicotine-light: #f8f8ee;
-$fg-dark: #000;
-$fg-light: #fff;
-$highlight-dark: #2f4858;
-$highlight-light: #3F5F6F;
-$highlight-light2: #eee;
-$border-color: #ccc;
-$border-color2: #aaa;
-$heading-fonts: serif;
-$visited: #fcc;
+// $nicotine-dark: #acae89;
+// $nicotine-light: #f8f8ee;
+// $fg-dark: #000;
+// $fg-light: #fff;
+// $highlight-dark: #2f4858;
+// $highlight-light: #3F5F6F;
+// $highlight-light2: #eee;
+// $border-color: #ccc;
+// $border-color2: #aaa;
+// $heading-fonts: serif;
+// $visited: #fcc;
+
+:root {
+  --clr-bg: #fff;
+  --clr-text: #000; // $fg-dark
+
+  --clr-bg-page: #f8f8ee; // $nicotine-light
+
+  --clr-bg-theme: #3F5F6F; // $highlight-light
+  --clr-text-theme: #fff; // $fg-light
+
+  --clr-bg-highlight: #eee; // $highlight-light2
+  --clr-text-highlight: #111111;
+
+  --clr-bg-accent: #acae89; // $nicotine-dark
+
+  --clr-text-visited: #fcc; // $visited
+
+  --clr-border: #ccc; // $border-color
+  --clr-border-dim: #aaa; // $border-color2
+  --clr-border-dark: #888;
+
+  --clr-shadow: var(--clr-border); 
+
+  --font-family: sans-serif;
+  --font-size: 14px;
+  --font-family-heading: serif; // $heading-fonts
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --clr-bg: #2f2f2f;
+    --clr-text: #ddd;
+    --clr-bg-page: #161616;
+
+    --clr-bg-theme: #111111;
+    --clr-text-theme: var(--clr-text);
+
+    --clr-bg-highlight: #606060;
+    --clr-text-highlight: #eee;
+
+    --clr-bg-accent: var(--clr-bg);
+
+    --clr-border: #666666;
+    --clr-border-dim: #444444;
+    --clr-border-dark: #222222;
+
+    --clr-shadow: #000;
+  }
+}
 
 * {
   box-sizing: border-box;
 }
+
+html {
+  color-scheme: light dark;
+}
+
 h1 a, h2 a {
-  color: $fg-light;
+  color: var(--clr-text-theme);
 }
 h1 a:visited, h2 a:visited {
-  color: $visited;
+  color: var(--clr-text-visited);
 }
 progress {
   width: 10ch;
 }
 
 body {
-  background-color: $nicotine-light;
-  color: $fg-dark;
-  font-family: sans-serif;
-  font-size: 14px;
+  background-color: var(--clr-bg-page);
+  color: var(--clr-text);
+  font-family: var(--font-family);
+  font-size: var(--font-size);
   line-height: 1.6;
   margin-left: auto;
   margin-right: auto;
@@ -99,28 +153,28 @@ body {
     li {
       display: inline;
       padding: 1ch;
-      background-color: $highlight-light2;
+      background-color: var(--clr-bg-highlight);
 
       a {
         text-decoration: none;
         display: inline-block;
-        color: #000;
+        color: var(--clr-text-highlight);
       }
     }
 
     li.current {
-      background-color: $highlight-light;
+      background-color: var(--clr-bg-theme);
       a {
-        color: #fff;
+        color: var(--clr-text-theme);
       }
     }
   }
 }
 
 .dialog {
-  border: 1px solid $border-color2;
-  box-shadow: 0 0 1ch $border-color;
-  background-color: #fff;
+  border: 1px solid var(--clr-border-dim);
+  box-shadow: 0 0 1ch var(--clr-shadow);
+  background-color: var(--clr-bg);
   padding: 1ch;
 
   h2 {
@@ -129,22 +183,22 @@ body {
     font-weight: normal;
     padding: 0.5ch;
     font-size: 12pt;
-    background-color: $highlight-light;
-    color: #fff;
+    background-color: var(--clr-bg-theme);
+    color: var(--clr-text-theme);
   }
 }
 
 header {
-  background-color: $nicotine-dark;
-  color: #fff;
-  border: 1px solid #888;
-  box-shadow: 0 0 0.5ch #888;
+  background-color: var(--clr-bg-accent);
+  color: var(--clr-text);
+  border: 1px solid var(--clr-border-dark);
+  box-shadow: 0 0 0.5ch var(--clr-border-dark);
   margin-bottom: 1ch;
 
   nav {
     a {
       text-decoration: none;
-      color: #000;
+      color: var(--clr-text);
 
       padding: .5ch;
       display: inline-block;
@@ -160,8 +214,8 @@ header {
     }
 
     a:hover, a:focus {
-      background: #2f4858;
-      color: #fff !important;
+      background: var(--clr-bg-theme);
+      color: var(--clr-text-theme);
     }
   }
 }
@@ -210,11 +264,11 @@ header {
     @extend .heading;
   }
 
-  background-color: #fff;
+  background-color: var(--clr-);
   padding: 1ch;
   margin: 1ch;
-  border: 1px solid $border-color2;
-  box-shadow: 0 0 1ch $border-color;
+  border: 1px solid var(--clr-border-dim);
+  box-shadow: 0 0 1ch var(--clr-shadow);
 }
 
 section.cards {
@@ -276,7 +330,8 @@ section.cards {
 
 .positions {
   box-shadow: 0 0 2px #888;
-  background-color: #e4e4e4;
+  background-color: var(--clr-bg-highlight);
+  color: var(--clr-text-highlight);
   padding: 2px;
   margin-right: -1ch;
   margin-left: 1ch;
@@ -297,13 +352,13 @@ footer {
 
   h1 {
     font-weight: normal;
-    border-bottom: 4px solid $highlight-light;
+    border-bottom: 4px solid var(--clr-bg-theme);
   }
 
   h2 {
     font-size: 14pt;
     font-weight: normal;
-    border-bottom: 2px solid $highlight-dark;
+    border-bottom: 2px solid var(--clr-bg-theme);
     width: 80%;
   }
 
@@ -312,9 +367,9 @@ footer {
     flex-basis: 40ch;
     flex-grow: 1.1;
 
-    background-color: #fff;
-    border-left: 1px solid $border-color2;
-    box-shadow: -1px -1px 5px $border-color;
+    background-color: var(--clr-bg);
+    border-left: 1px solid var(--clr-border-dim);
+    box-shadow: -1px -1px 5px var(--clr-shadow);
 
     padding-left: 1ch;
     padding-right: 1ch;
@@ -329,18 +384,18 @@ footer {
 }
 
 .shadowbox {
-  box-shadow: 0 0 1ch $border-color2;
-  border: 1px solid $border-color;
+  box-shadow: 0 0 1ch var(--clr-shadow);
+  border: 1px solid var(--clr-border);
 }
 
 .heading {
   margin: 0;
   padding: 0.5ch;
-  background-color: $highlight-light;
-  border-bottom: 1px solid $border-color2;
-  font-family: $heading-fonts;
+  background-color: var(--clr-bg-theme);
+  border-bottom: 1px solid var(--clr-border-dim);
+  font-family: var(--font-family-heading);
   font-weight: normal;
-  color: $fg-light;
+  color: var(--clr-text-theme);
   font-size: 12pt;
   word-break: break-word;
 }
@@ -440,7 +495,7 @@ footer {
   @extend .shadowbox;
 
   padding: 0.5ch;
-  background-color: $fg-light;
+  background-color: var(--clr-bg);
   display: grid;
   grid-template-columns: max-content 0 auto max-content;
   grid-gap: 0.5ch;
@@ -452,9 +507,9 @@ footer {
     padding: 0.5ch;
     font-size: 14pt;
     word-break: keep-all;
-    background-color: $highlight-light;
-    color: $fg-light;
-    font-family: $heading-fonts;
+    background-color: var(--clr-bg-theme);
+    color: var(--clr-text-theme);
+    font-family: var(--font-family-heading);
     font-weight: normal;
     border: 1px solid;
     text-align: center;
@@ -469,16 +524,13 @@ footer {
     font-family: monospace;
     font-size: 12pt;
     padding: 0.5ch;
-    border: 1px solid $border-color2;
-    background-color: $fg-light;
-    color: $fg-dark;
+    border: 1px solid var(--clr-border-dim);
   }
 
   input[type="submit"] {
     font-size: 12pt;
-    border: 1px solid $border-color2;
-    background-color: $fg-light;
-    color: $fg-dark;
+    border: 1px solid var(--clr-border-dim);
+    background-color: var(--clr-bg);
   }
 
   .suggestions {
@@ -528,22 +580,22 @@ footer {
 #filters {
   @extend .shadowbox;
   margin-top: 1ch;
-  background-color: $fg-light;
+  background-color: var(--clr-bg);
 
   h2 {
     @extend .heading;
-    background-color: $highlight-light;
+    background-color: var(--clr-bg-theme);
   }
   h3 {
     @extend .heading;
-    background-color: $highlight-light2;
+    background-color: var(--clr-bg-highlight);
     font-family: sans-serif;
     color: #000;
     border-bottom: 1px solid #000;
   }
 
   hr {
-    border-top: 0.5px solid $border-color2;
+    border-top: 0.5px solid var(--clr-border-dim);
     border-bottom: none;
   }
   ul {
@@ -553,17 +605,17 @@ footer {
     li {
       padding: 1ch;
       a {
-        color: $fg-dark;
+        color: inherit;
         text-decoration: none;
       }
       a:hover, a:focus {
-        border-bottom: 1px solid $highlight-light;
+        border-bottom: 1px solid var(--clr-bg-theme);
       }
     }
 
     li.current {
-      border-left: 4px solid $highlight-light;
-      background-color: $highlight-light2;
+      border-left: 4px solid var(--clr-bg-theme);
+      background-color: var(--clr-bg-highlight);
       a {
         margin-left: -4px;
       }
@@ -576,46 +628,46 @@ footer {
   margin: 1ch 0 2ch 0;
 
   .url {
-    background-color: $highlight-light;
+    background-color: var(--clr-bg-theme);
     padding-left: 0.5ch;
 
     a {
       word-break: break-all;
       font-family: monospace;
       font-size: 8pt;
-      color: $fg-light;
+      color: var(--clr-text-theme);
       text-shadow: 0 0 1ch #000; // guarantee decent contrast across background colors
     }
     a:visited {
-      color: $visited;
+      color: var(--clr-text-visited);
     }
   }
 
   h2 {
     a {
       word-break: break-all;
-      color: $fg-dark;
+      color: var(--clr-text);
       text-decoration: none;
     }
     font-size: 12pt;
     @extend .heading;
-    background-color: $highlight-light2;
+    background-color:var(--clr-bg-highlight);
   }
 
   .description {
-    background-color: $fg-light;
+    background-color: var(--clr-bg);
     word-break: break-word;
     padding: 1ch;
     margin: 0;
   }
 
   ul.additional-results {
-    background-color: $fg-light;
+    background-color: var(--clr-bg);
     padding: 1ch;
     list-style: none;
     margin: 0;
     a {
-        color: $fg-dark;
+        color: inherit;
     }
   }
 }
@@ -631,7 +683,7 @@ footer {
   display: flex;
   font-size: 10pt;
   padding: 1ch;
-  background-color: #eee;
+  background-color: var(--clr-bg-highlight);
 
   > * {
     margin-right: 1ch;
@@ -645,7 +697,7 @@ footer {
     padding-left: 4px;
   }
   a {
-    color: #000;
+    color: var(--clr-text-highlight);
   }
 }