web-extension-starter/opera/css/popup.css

@import url(https://fonts.googleapis.com/css?family=Nunito:400,600);*,:after,:before{box-sizing:border-box}:focus{outline:0}ol,ul{list-style-type:none}*{margin:0;padding:0;border:0;outline:0}body{overflow-x:hidden}a:link{text-decoration:none}body{color:#0d0d0d;background-color:#f3f3f3}#popup{min-width:350px;padding:30px 20px}#popup h2{font-size:25px;text-align:center}#popup #options__button{width:50%;background:green;color:#fff;font-weight:500;border-radius:15px;padding:5px 10px;justify-content:center;margin:20px auto;cursor:pointer;opacity:.8;display:flex}#popup .links__holder ul{display:flex;margin-top:1em;justify-content:space-around}#popup .links__holder ul li button{border-radius:25px;font-size:20px;font-weight:600;padding:10px 17px;background-color:rgba(0,0,255,.7);color:#fff;cursor:pointer}