<div class="square-box"> <div class="content"> <div class="center-box"> <img class="thumb" src="/path/thumbnail.png"> div> div> div> .square-box { position: relative; } .square-box:before { display: block; content: ""; padding-top: 100%; } .square-box .content { position: absolute; top: 0; width: 100%; height: 100%; box-sizing: border-box; overflow: hidden; } .thumb { width: 100%; height: auto; }