关于区域置灰----总体思路就是利用::before伪元素覆盖一下

.disagree{
  border:2px solid red;
  border-radius: 4px;
  position: relative;
  &::before {
    content: '';
    background-color: #f9f9f999;
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 10;
    left: 0;
    top: 0;
  }
}