.slider a::before{
content: "";
display: block;
height: 120px;
width: 120px;
border:5px solid #fff;
border-radius: 50%;
position: absolute;
left: 50%;
margin-left: -60px;
z-index: 99999;
top: -80px;
background:rgba(0,0,0,0.3);
}
.slider a:hover::before{
opacity: 0;
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