制作遮罩层的样式

遮罩层的样式

<div class="content">
  11111
  <div class="mark"></div>
</div>

.content {
   100px;
  height: 100px;
  background: #fff;
  border: 1px solid red;
  position: relative;
}
.mark {
   100%;
  height: 100%;
  position: absolute;
  background: rgba(0, 0, 0, 0.2);
  top: 0;
  left: 0;
  z-index: 100;
  cursor: pointer;
  transition: all 0.15s;
}
.mark:hover {
  background: rgba(0, 0, 0, 0.6);
}