Professional WordPress Plugins and Services. wpDiscuz, WooDiscuz, Advanced Post Pagination
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.fa-window-close:before {
content: "\f410" !important;
}
Because that X in corner was not visible i was trying to use cancel button to close the window which is not for closing the window but for file attachment upload cancellation. 😀
Thanks it worked.
P.s. i wanted to add an emoticon but got a error here on this site i remember had similar and Robert told to update in database something related to unicode i think.