.gallery {
        list-style: none;
        overflow: hidden;
        padding: 0;
        margin: 0;
    }
    
    .gallery li {
         position: relative;
  float: left;
  margin-bottom:3%;
  width: 23.5%;
  overflow: hidden;margin-right: 2%;
    } .gallery li:nth-child(4n) {
  margin-right: 0;
}