<style> .container { width: 400px; height: 400px; border: 1px #cccccc solid; margin: 30px auto; position: relative; } .box { width: 40px; height: 40px; background-color: #d17575; position: absolute; top: 20px; left: 20px; } </style> <div class=”container”> <div class=”box”></div> </div>