diff --git a/docs/_static/css/main.css b/docs/_static/css/main.css
index eb7139223244..1cc82f948563 100644
--- a/docs/_static/css/main.css
+++ b/docs/_static/css/main.css
@@ -1335,7 +1335,6 @@ span.caption-text {
         left: 0;
         width: 240px;
         padding-top: 7.7em;
-        background: none;
         font-size: 0.9em;
     }