css 设置画对角斜线

/* 通过 css 画 div 的对角斜线 */
background: linear-gradient(to top right, #EEF2F8, #EEF2F8 48%, #CEDFF8, #EEF2F8 51%, #EEF2F8);

/* element-ui table 表头 */

.header-column {
  height: 49px;
  position: relative;

  &:before {
    position: absolute;
    content: ' ';
    height: 100%;
    width: 100%;
    color: #bbbbbc;
    background: linear-gradient(to top right, #EEF2F8, #EEF2F8 48%, #CEDFF8, #EEF2F8 51%, #EEF2F8);
    left: 0;
    top: 0;
  }

  .headerCon1 {
    position: absolute;
    bottom: @margin;
    left: @margin;
  }

  .headerCon2 {
    position: absolute;
    top: @margin;
    right: @margin;
  }
}