diff --git a/themes/Ying/assets/css/main.css b/themes/Ying/assets/css/main.css
index 0b43384d..1df0554e 100644
--- a/themes/Ying/assets/css/main.css
+++ b/themes/Ying/assets/css/main.css
@@ -42,7 +42,6 @@
 [data-theme="dark"] body {
     color: var(--text-content-dark-color);
     background-color: var(--background-dark-color);
-    background-image: none;
 }
 
 [data-theme="dark"] .main {
@@ -4936,3 +4935,22 @@ html[data-theme="light"] .atk-loading-spinner svg circle {
     }
 }
 
+
+
+/* Dark Mode Background Mask */
+body {
+    position: relative;
+}
+
+[data-theme='dark'] body::before {
+    content: '';
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.4);
+    z-index: -1;
+    pointer-events: none;
+    transition: background 0.3s ease;
+}