.oew-btn-effect-8 a{border:1px solid rgba(0, 0, 0, 0.2);position:relative}.oew-btn-effect-8 a span{position:relative;z-index:2}.oew-btn-effect-8 a::before{content:"";position:absolute;top:0;left:0;width:0%;height:100%;z-index:1;opacity:0;background-color:rgba(0, 0, 0, 0.2);-webkit-transition:all .3s;-moz-transition:all .3s;-o-transition:all .3s;transition:all .3s}.oew-btn-effect-8 a:hover::before{opacity:1;width:100%}