3D翻转实例
<div class="letter-top-box">
<img class="letter-top" src="img/letter-top.png" alt="letter-top" />
<img class="letter-top-cover" src="img/letter-top-cover.png" alt="letter-top" />
</div>
.letter-top-box {
position: absolute;
top: 6px;
left: 0;
width: 100%;
height: 50%;
transform-origin: 0 0;
transform-style: preserve-3d;
transition: 1.2s linear transform;
z-index: 4;
}
.letter-top-box .letter-top-cover,
.letter-top-box .letter-top {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 160px;
backface-visibility: hidden;
transform-style: preserve-3d;
}