exec按钮样式调整

public/stylesheets/nyan.css

@@ -1433,8 +1433,8 @@ ul.contest-notification-list li span{
 }
 
 .xls {
-    background: url('../images/icon_excel.gif') no-repeat scroll 1px 50% transparent;
-    padding: 2px 0px 3px 16px;
+    /*background: url('../images/icon_excel.gif') no-repeat scroll 1px 50% transparent;*/
+    /*padding: 2px 0px 3px 16px;*/
     font-family:微软雅黑 !important;
     font-size: 12px !important;
     color: #136b3b !important;