Fix the color inconsistency when exporting

Author: Fentaniao

src/liquid/color-dark.css

@@ -16,7 +16,7 @@
     --table-background-color: var(--Mica);
 
     --window-border: 1px solid #555;
-    --bg-color: #363B40;
+    --bg-color: #232736;
     --rawblock-edit-panel-bd: #333;
     --search-select-bg-color: #428bca;