这可能是一个大概的想法：
div { width: 200px; height: 100px; background: #ddd; margin: 20px 150px; position: relative}div:before { content: ''; line-height: 0; font-size: 0; width: 0; height: 0; border-top: 50px solid transparent; border-bottom: 50px solid #ddd; border-left: 50px solid transparent; border-right: 50px solid #ddd; position: absolute; top: 0; left: -99px;}div:after { content: ''; line-height: 0; font-size: 0; width: 0; height: 0; border-top: 50px solid transparent; border-bottom: 50px solid #ddd; border-left: 50px solid #ddd; border-right: 50px solid transparent; position: absolute; top: 0; right: -99px;}<div>Hello</div><div>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam cursus ex quis enim posuere auctor.</div>
