.btnfos-4{overflow:hidden;position:relative}.btnfos-4:after{background:#ffffff;content:"";height:155px;left:-75px;opacity:.8;position:absolute;top:-50px;width:50px;-webkit-transform:rotate(35deg);-ms-transform:rotate(35deg);transform:rotate(35deg);z-index:10}.btnfos-4:after,.btnfos-4:hover:after{-webkit-transition:all 1.55s cubic-bezier(.19,1,.22,1);transition:all 1.55s cubic-bezier(.19,1,.22,1)}.btnfos-4:hover:after{left:120%}