Add support for dark mode

styles/globals.css

@@ -13,6 +13,14 @@ body,
     Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
 }
 
+body {
+  background-color: #a7b6c2;
+}
+
+body.bp3-dark {
+  background-color: #202b33;
+}
+
 a {
   color: inherit;
   text-decoration: none;