宽度(px)

<style> .hex{ width:100%;height:58%; top:21%; position:relative; background:#74CDDB; } .hex:after,.hex:before{ position: absolute; content: ''; width: 100%; height: 100%; left: 0; top: 0; background:#74CDDB; } .hex:after{ -webkit-transform: rotateZ(60deg); } .hex:before{ -webkit-transform: rotateZ(120deg); } </style> <div style="width:100px;height:100px;"> <div class="hex"></div> </div>