diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index 4647711247..71b486188f 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -2950,6 +2950,7 @@ table th[class*="span"],
   cursor: default;
   background-color: transparent;
   background-image: none;
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
 }
 
 .open {
diff --git a/less/dropdowns.less b/less/dropdowns.less
index 90f3741e85..484bd3dda3 100644
--- a/less/dropdowns.less
+++ b/less/dropdowns.less
@@ -115,6 +115,7 @@
   text-decoration: none;
   background-color: transparent;
   background-image: none; // Remove CSS gradient
+  .reset-filter();
   cursor: default;
 }