diff --git a/themes/yilia/source-src/css/night.scss b/themes/yilia/source-src/css/night.scss
index 1d434d7..ac0921a 100644
--- a/themes/yilia/source-src/css/night.scss
+++ b/themes/yilia/source-src/css/night.scss
@@ -87,7 +87,7 @@ body.night {
   }
   // 左侧栏
   .left-col {
-    background: $articleBg_night;
+    background-color: $articleBg_night;
     background-image: none !important;
   }
   #mobile-nav {