.gallery{margin-bottom:20px;display:flex;flex-wrap:wrap;justify-content:flex-start;}
.gallery .gallery-item{text-align:center;overflow:hidden;background-size:cover;background-position:50% 50%;content:'';position:relative;width:25%;}
.gallery .gallery-item a{
position:absolute;
content: '';
width:100%;
height:100%;
top:0;
left:0;
}