diff --git a/pixelegg/less/jquery-ui.less b/pixelegg/less/jquery-ui.less
index 32fb997ee2..64a7af9343 100755
--- a/pixelegg/less/jquery-ui.less
+++ b/pixelegg/less/jquery-ui.less
@@ -182,6 +182,8 @@ option:checked {background-color: @egw_color_1_e;}
     color: @red;
 }
 
+// used in mail for drag and drop mails
+.drop-hover {background-color: @egw_color_1_e;}
 
 .ui-icon-close{
     /*visibility: hidden;*/