diff --git a/src/css/docusaurus.scss b/src/css/docusaurus.scss
index edd34ae4..c6117cb2 100644
--- a/src/css/docusaurus.scss
+++ b/src/css/docusaurus.scss
@@ -136,7 +136,7 @@ a.card {
     }
 
     .alert--success {
-      --ifm-alert-background-color: transparent;
+      --ifm-alert-background-color: #181818;
       --ifm-alert-border-color: var(--ifm-color-primary);
       --ifm-alert-background-color-highlight: var(--ifm-color-primary);
     }