纯CSS选择层

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html

css

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html

css

.list-group {
  margin-top: 100px;
}

.square-group {
  position: relative;
  margin: 100px 200px;
}

.square:nth-child(1) {
  top: 30px;
  z-index: 9;
}

.square:nth-child(2) {
  top: 60px;
  z-index: 8;
}

.square:nth-child(3) {
  top: 90px;
  z-index: 7;
}

.square:nth-child(4) {
  top: 120px;
  z-index: 6;
}

.square:nth-child(5) {
  top: 150px;
  z-index: 5;
}

.square:nth-child(6) {
  top: 180px;
  z-index: 4;
}

.square:nth-child(7) {
  top: 210px;
  z-index: 3;
}

.square:nth-child(8) {
  top: 240px;
  z-index: 2;
}

.square:nth-child(9) {
  top: 270px;
  z-index: 1;
}

.square:nth-child(10) {
  top: 300px;
  z-index: 0;
}

.square {
  box-sizing: border-box;
  position: absolute;
  top: 0;
  left: 0;
  width: 500px;
  height: 200px;
  padding: 20px;
  background: rgba(195, 39, 43, 0.2);
  box-shadow: 0 0 2px 1px rgba(153, 31, 34, 0.4);
  -webkit-transform: matrix3d(1, 0, 0, 0, -0.5, 0.5, 0, 0, 0, 0, 1, 0, 50, 50, 0, 1);
          transform: matrix3d(1, 0, 0, 0, -0.5, 0.5, 0, 0, 0, 0, 1, 0, 50, 50, 0, 1);
  -webkit-transform-origin: 0px 0px;
          transform-origin: 0px 0px;
  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;
  cursor: pointer;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  z-index: 10;
}
.square .square__inner {
  color: #fff;
  opacity: 0;
  -webkit-transition: opacity .3s ease-out;
  transition: opacity .3s ease-out;
}
.square:hover {
  background: rgba(195, 39, 43, 0.8);
}
.square:active, .square:target {
  top: 0;
  -webkit-transform: matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
          transform: matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
  background: #8f1d21;
  z-index: 11;
}
.square:active .square__inner, .square:target .square__inner {
  opacity: 1;
}

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