diff --git a/docs/1.x.x/en/styles/website.css b/docs/1.x.x/en/styles/website.css
index ef145c0f29..b53dd85b40 100644
--- a/docs/1.x.x/en/styles/website.css
+++ b/docs/1.x.x/en/styles/website.css
@@ -10,7 +10,7 @@ li.chapter a{
 }
 
 li.chapter:hover a{
-  background-color: #eee !important;
+  background: #eee !important;
   text-decoration: none !important;
 }
 
diff --git a/docs/3.x.x/en/styles/website.css b/docs/3.x.x/en/styles/website.css
index ef145c0f29..b53dd85b40 100644
--- a/docs/3.x.x/en/styles/website.css
+++ b/docs/3.x.x/en/styles/website.css
@@ -10,7 +10,7 @@ li.chapter a{
 }
 
 li.chapter:hover a{
-  background-color: #eee !important;
+  background: #eee !important;
   text-decoration: none !important;
 }