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/*游標移至朋友鈕時出現圖案*/
.pif-user-add.add_friend::after,.pif-user-asking.pending::after,.pif-user-friend.add_friend::after {
content:url(網址)  ;
position:absolute;
opacity:0;
top: 0px; left: calc(50% - 圖片大小px / 2); /*方便置中*/
transition:opacity .5s;
}

.pif-user-add.add_friend:hover::after,.pif-user-asking.pending:hover::after,.pif-user-friend.add_friend:hover::after{opacity:1;}