diff --git a/index.html b/index.html
index ec9d64d..8d44ca2 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,7 @@
 		<meta charset="utf-8">
 		<meta name="viewport" content="width=device-width, initial-scale=1, minimal-ui">
 		<title>GitHub Markdown CSS demo</title>
+		<meta name="color-scheme" content="light dark">
 		<link rel="stylesheet" href="github-markdown.css">
 		<style>
 			body {
@@ -13,6 +14,11 @@
 				margin: 0 auto;
 				padding: 45px;
 			}
+			@media (prefers-color-scheme: dark) {
+				body {
+					background-color: #0d1117;
+				}
+			}
 		</style>
 		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/github-fork-ribbon-css/0.2.3/gh-fork-ribbon.min.css">
 		<style>