diff --git a/src/ui/css/diff2html.css b/src/ui/css/diff2html.css
index 1684cd2..6e49b1b 100644
--- a/src/ui/css/diff2html.css
+++ b/src/ui/css/diff2html.css
@@ -506,3 +506,129 @@
 .d2h-dark-color-scheme .d2h-moved-tag {
   border: #3572b0 1px solid;
 }
+
+/**
+ * Auto Mode Colors
+ */
+@media (prefers-color-scheme: dark) {
+  .d2h-auto-color-scheme .d2h-files-diff,
+  .d2h-auto-color-scheme .d2h-files-diff .d2h-emptyplaceholder {
+    background-color: #272822;
+    color: #d0d0d0;
+  }
+
+  .d2h-auto-color-scheme .d2h-wrapper {
+    color: #d0d0d0;
+    background-color: #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-header {
+    color: #d0d0d0;
+    background-color: #272822;
+    border-bottom: #494b40;
+  }
+
+  .d2h-auto-color-scheme .d2h-code-line del,
+  .d2h-auto-color-scheme .d2h-code-side-line del {
+    background-color: #604243;
+  }
+
+  .d2h-auto-color-scheme .d2h-code-line ins,
+  .d2h-auto-color-scheme .d2h-code-side-line ins {
+    background-color: #195219;
+  }
+
+  .d2h-auto-color-scheme .d2h-code-side-linenumber {
+    background-color: #272822;
+    color: #d0d0d0;
+    border-color: #494b40;
+  }
+
+  .d2h-auto-color-scheme .d2h-files-diff .d2h-code-side-emptyplaceholder,
+  .d2h-auto-color-scheme .d2h-files-diff .d2h-emptyplaceholder {
+    background-color: #494b40;
+    border-color: #66695a;
+  }
+
+  .d2h-auto-color-scheme .d2h-del {
+    background-color: #905a5c;
+    border-color: #a07c7e;
+  }
+
+  .d2h-auto-color-scheme .d2h-ins {
+    background-color: #177016;
+    border-color: #219f1f;
+  }
+
+  .d2h-auto-color-scheme .d2h-info {
+    background-color: #32342c;
+    color: #929292;
+    border-color: #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-diff .d2h-del.d2h-change {
+    background-color: #d0b44c;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-diff .d2h-ins.d2h-change {
+    background-color: #d0b44c;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-wrapper {
+    border: 1px solid #494b40;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-collapse {
+    border: 1px solid #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-collapse.d2h-selected {
+    background-color: #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-code-linenumber {
+    background-color: #272822;
+    color: #d0d0d0;
+    border-color: #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-list-wrapper a {
+    color: #3572b0;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-list-wrapper a:visited {
+    color: #3572b0;
+  }
+
+  .d2h-auto-color-scheme .d2h-file-list > li {
+    border-bottom: #272822 solid 1px;
+  }
+
+  .d2h-auto-color-scheme .d2h-changed {
+    color: #d0b44c;
+  }
+
+  .d2h-auto-color-scheme .d2h-moved {
+    color: #3572b0;
+  }
+
+  .d2h-auto-color-scheme .d2h-tag {
+    background-color: #272822;
+  }
+
+  .d2h-auto-color-scheme .d2h-deleted-tag {
+    border: #a07c7e 1px solid;
+  }
+
+  .d2h-auto-color-scheme .d2h-added-tag {
+    border: #177016 1px solid;
+  }
+
+  .d2h-auto-color-scheme .d2h-changed-tag {
+    border: #d0b44c 1px solid;
+  }
+
+  .d2h-auto-color-scheme .d2h-moved-tag {
+    border: #3572b0 1px solid;
+  }
+}