修改了css引用方式[CI SKIP]

static/src/css/admin.css

@@ -6,6 +6,7 @@
 @import url("webuploader/webuploader.css");
 @import url("datetime_picker/bootstrap-datetimepicker.css");
 @import url("tagEditor/jquery.tag-editor.css");
+@import url("add_contest.css");
 
 #loading-gif{
     width: 40px;