diff --git a/themes/base/ui.theme.css b/themes/base/ui.theme.css
index ee4c00b66f..376ea1ca7e 100644
--- a/themes/base/ui.theme.css
+++ b/themes/base/ui.theme.css
@@ -13,7 +13,7 @@
 .ui-widget-header a { color: #222222/*{fcHeader}*/; }
 .ui-widget-content { border: 1px solid #aaaaaa/*{borderColorContent}*/; background: #ffffff/*{bgColorContent}*/ url(images/ffffff_40x100_textures_02_glass_75.png)/*{bgImgUrlContent}*/ 0 0/*{bgContentYPos}*/ repeat-x/*{bgContentRepeat}*/; color: #222222/*{fcContent}*/; }
 .ui-widget-content a { color: #222222/*{fcContent}*/; }
-.ui-widget-overlay { border: 4px solid #aaaaaa/*{borderColorContent}*/; }
+.ui-widget-overlay { background: #aaaaaa/*{borderColorContent}*/; opacity: .3; filter:Alpha(Opacity=30); }
 
 /* Interaction states
 ----------------------------------*/