dark mode css

public/app.css

@@ -2,6 +2,13 @@ body {
 	margin:0;
 }
 
+@media (prefers-color-scheme: dark) {
+	body {
+		background-color: black;
+		color: lightgrey;
+	}
+}
+
 td,th {
 	border:1px solid black;
 	padding:1em;