#copy_tip_box{
    position:fixed;
    left:50%;
    top:40%;
    transform:translate(-50%,-50%);
    background:rgba(0,0,0,0.75);
    color:#fff;
    padding:12px 24px;
    border-radius:8px;
    z-index:999999;
    font-size:15px;
    white-space:nowrap;
    opacity:1;
    transition:opacity 0.4s;
}
#copy_tip_box.fadeout{
    opacity:0;
}