diff --git a/base.css b/base.css
index 6e3f285..fdfe363 100644
--- a/base.css
+++ b/base.css
@@ -1,13 +1,26 @@
+:root {
+	--fg-light-mode: #454545;
+	--bg-light-mode: #fefefe;
+	--fg-dark-mode: #ccc;
+	--bg-dark-mode: #111;
+}
+
 body {
 	font-family: monospace, sans-serif;
-	color: #454545;
+	color: var(--fg-light-mode);
 	font-size: 16px;
 	margin: 2em auto;
 	max-width: 800px;
 	padding: 1em;
 	line-height: 1.4;
 	overflow-wrap: break-word;
-	background-color: #fefefe;
+	background-color: var(--bg-light-mode);
+}
+
+@media (prefers-color-scheme: dark) {
+	color: var(--fg-dark-mode);
+	background-color: var(--bg-dark-mode);
+
 }
 
 a { color: #07a; }