CSS边框长度控制功能的实现一文教你玩转CSS border(边框)CSS 奇思妙想边框动画效果的实现CSS3 按钮边框动画的实现CSS3 实现发光边框特效两款纯CSS3鼠标经过按钮边框动画特效一篇文章带你学习CSS3图片边框css3多种边框悬停按钮填色动画特效css 透明边框background-clip妙用CSS3实现缺角矩形，折角矩形以及缺角边框CSS实现半透明边框与多重边框的场景分析

border top
border left
border right
border bottom

 .box-container { position: relative; width: 90%; color: #777; } .border-top { background: #b4bcbf; padding: 15px; } .border-top:before { content: ''; position: absolute; left: 42%; top: 0; bottom: auto; right: auto; height: 7px; width: 50%; background-color: #8796a9; } .border-left { background: #dfdad6; padding: 15px; } .border-left:before { content: ''; position: absolute; left: 0; top: 6%; bottom: auto; right: auto; height: 52%; width: 5px; background-color: #a89d9e; } .border-right { background: #eee9c4; padding: 15px; } .border-right:after { content: ''; position: absolute; left: auto; top: auto; bottom: 5px; right: 0; height: 52%; width: 5px; background-color: #f39c81; } .border-bottom { background: #bcdc9d; padding: 15px; } .border-bottom:after { content: ''; position: absolute; left: 18px; top: auto; bottom: 0; right: auto; height: 6px; width: 105px; background-color: #32b66b; }