diff --git a/assets/css/common/post-single.css b/assets/css/common/post-single.css
index c7b8268..30ec594 100644
--- a/assets/css/common/post-single.css
+++ b/assets/css/common/post-single.css
@@ -169,7 +169,7 @@
 
 .post-content .highlight pre {
     margin: 0;
-    background-color: var(--theme);
+    background-color: var(--theme) !important;
 }
 
 .post-content .highlighttable {