.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 0.3s;-moz-transition:all 0.3s;-o-transition:all 0.3s;transition:all 0.3s}.oew-btn-effect-8 a:hover::before{opacity:1;width:100%}