Update main.css

themes/Ying/assets/css/main.css

@@ -40,7 +40,10 @@ html {
 [data-theme="dark"] body {
     color: var(--text-content-dark-color);
     background-color: var(--background-dark-color);
-    background-image: none;
+    background-image: none !important;
+    background-repeat: initial !important;
+    background-size: initial !important;
+    background-attachment: initial !important;
 }
 
 [data-theme="dark"] .main {