Update style.css

style.css

@@ -26,3 +26,16 @@ p {
 .card p:last-child {
 	margin-bottom: 0;
 }
+
+@media (prefers-color-scheme: dark) {
+  .html {
+    background: black;
+    color: gray;
+  }
+}
+
+@media (prefers-color-scheme: light) {
+  .html {
+    background: yellow;
+  }
+}