html+css打开空盒子

html部分

  <div class="box">
    <div class="side front"></div>
    <div class="side back"></div>
    <div class="side left"></div>
    <div class="side right"></div>
    <div class="side top">
      <div class="tl"></div>
      <div class="tr"></div>
    </div>
    <div class="side bottom"></div>
  </div>

css部分

*{
  margin:0;
  padding:0;
  box-sizing: border-box;
}
body{
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgb(5, 243, 243);
}
.box{
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  transform-style:preserve-3d;
  perspective: 1000px;
  transform: rotateX(-20deg);
}
.side{
  position: absolute;
  width: 200px;
  height: 200px;
  background-color: rgb(226, 205, 15);
  border: 1px solid #fff;
}
.front {
  transform:translateZ(100px)
}
.back{
  transform: translateZ(-100px) rotateY(180deg);
}
.left{
  transform: translateX(-100px) rotateY(-90deg);
}
.right{
  transform: translateX(100px) rotateY(90deg);
}
.top{
  transform: translateY(-100px) rotateX(90deg);
  background-color: transparent;
  transform-style:preserve-3d;
}
.top div{
  background-color: rgb(226, 205, 15);
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  border:1px solid #fff;
}
.top .tl {
  left: 0;
  transform-origin: left;
}
.top .tr{
  right: 0;
  transform-origin: right;
}
.bottom{
  transform: translateY(100px) rotateX(-90deg);
  box-shadow: 5px -5px 15px rgb(0,0,0,0.4);
}
.box:hover .top .tl {
  transform: rotateY(-135deg);
}
.box:hover .top .tr {
  transform: rotateY(135deg);
}