.social-tabs ul li a{position:relative}.social-tabs ul li a:before{position:absolute;bottom:-4px;left:0;width:100%;height:4px;content:"";border-radius:4px 4px 0 0;background:#1976d2;opacity:0}.social-tabs ul li a span:before{content:none}.social-tabs ul li[class*=activeClass] a:before{opacity:1}