.mosaicflow__item { padding:3px; } .mosaicflow__column { float:left; } .mosaicflow__item img { display:block; width:100%; height:auto; padding: 4px; background-color: #fff; border: 1px solid #ddd; border-radius: 4px; } .mosaicflow__item img:hover { opacity: 0.6; filter: alpha(opacity=60); }