:root{--sk-size:60px;--sk-color:#ffb3cc}
@keyframes sk-fold{
0%,10%{transform:perspective(140px) rotateX(-180deg);opacity:0}
25%,75%{transform:perspective(140px) rotateX(0);opacity:1}
100%,90%{transform:perspective(140px) rotateY(180deg);opacity:0}}