CSS纸张折叠效果，HTML/Vue代码在线实时编辑、预览

            
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            .jaffee {
  position: relative;
  display: inline-flex;
  transform: rotateX(10deg); 
  transform-style: preserve-3d;
  cursor: grab;
}

.jaffee img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 90vh;
  opacity: 0;
}

.jaffee .a,
.jaffee .b,
.jaffee .c {
  top: 0;
  display: inline-block;
  height: 100%;
  background-image: var(--bg);
  background-size: cover;
  background-repeat: no-repeat;
}

.jaffee .a {
  position: absolute;
  left: 0;
  width: 50%;
  background-position: 0 0;
}

.jaffee .bc {
  position: absolute;
  display: inline-flex;
  width: 50%;
  height: 100%;
  left: 50%;
  transform-origin: left;
  transition: transform 3s;
  transform-style: preserve-3d;
}

.jaffee .b,
.jaffee .c {
  position: relative;
  width: 50%;
  backface-visibility: hidden;
}

.jaffee .b {
  background-position: 66.666667% 0;
  transform-style: preserve-3d;
}

.jaffee .b:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #000;
  transform: rotateY(180deg) translateZ(1px);
  transform-style: preserve-3d;
  backface-visibility: hidden;
}

.jaffee .c {
  background-position: 100% 0;
  transform-origin: left;
  transition: transform 2s;
}

.jaffee:hover .bc,
.jaffee:active .bc {
  transform: rotateY(-180deg) translateZ(-1px);
  transition: transform 2s;
}

.jaffee:hover .c,
.jaffee:active .c {
  transform: rotateY(180deg) translateZ(2px);
  transition: transform 3s;
}