@keyframes warn {

 

 }

 .mask-white { position:absolute; top:0; left:0; width:100%; height:100%; background:rgba(255,255,255,.2); content:''; -webkit-transition:-webkit-transform .6s; 
    transition:transform .6s; -webkit-transform:scale3d(2.2,1.4,1) rotate3d(0,0,1,45deg) translate3d(0,-100%,0); transform:scale3d(2.2,1.4,1) rotate3d(0,0,1,45deg) translate3d(0,-100%,0) }
.index-about .right:hover .mask-white{ -webkit-transform:scale3d(2.2,1.4,1) rotate3d(0,0,1,45deg) translate3d(0,100%,0); transform:scale3d(2.2,1.4,1) rotate3d(0,0,1,45deg) translate3d(0,100%,0)}