fix: waf condition

cmd/dashboard/controller/waf/waf.html

@@ -24,6 +24,13 @@
             font-size: 12px;
             color: #888;
         }
+
+        @media (prefers-color-scheme: dark) {
+            body {
+                background-color: #111;
+                color: #007C41
+            }
+        }
     </style>
 </head>