.sk-folding-cube{width:40px;height:40px;margin:20px auto;position:relative;transform:rotate(45deg)}.sk-folding-cube .sk-cube{float:left;width:50%;height:50%;position:relative;transform:scale(1.1)}.sk-folding-cube .sk-cube:before{content:"";transform-origin:100% 100%;background-color:#333;width:100%;height:100%;animation:2.4s linear infinite both sk-foldCubeAngle;position:absolute;top:0;left:0}.sk-folding-cube .sk-cube2{transform:scale(1.1)rotate(90deg)}.sk-folding-cube .sk-cube3{transform:scale(1.1)rotate(180deg)}.sk-folding-cube .sk-cube4{transform:scale(1.1)rotate(270deg)}.sk-folding-cube .sk-cube2:before{animation-delay:.3s}.sk-folding-cube .sk-cube3:before{animation-delay:.6s}.sk-folding-cube .sk-cube4:before{animation-delay:.9s}@keyframes sk-foldCubeAngle{0%,10%{opacity:0;transform:perspective(140px)rotateX(-180deg)}25%,75%{opacity:1;transform:perspective(140px)rotateX(0)}90%,to{opacity:0;transform:perspective(140px)rotateY(180deg)}}