css 实现div 4个角尖角边框样式

Posted 2021-11-24 Leatitia

经常使用的一个小技巧，在不添加额外元素的情况下，使用background绘制div的4个角border

.is-active:before{
          content: '';
          position: absolute;
          top: 2px;
          left: 2px;
          width: 100%;
          height: 100%;
          background: linear-gradient(to left, #f00, #f00) left top no-repeat,
          linear-gradient(to bottom, #f00, #f00) left top no-repeat,
          linear-gradient(to left, #f00, #f00) right top no-repeat,
          linear-gradient(to bottom, #f00, #f00) right top no-repeat,
          linear-gradient(to left, #f00, #f00) left bottom no-repeat,
          linear-gradient(to bottom, #f00, #f00) left bottom no-repeat,
          linear-gradient(to left, #f00, #f00) right bottom no-repeat,
          linear-gradient(to left, #f00, #f00) right bottom no-repeat;
          background-size: 1px 5px, 5px 1px, 1px 5px, 5px 1px;
        }