*{box-sizing:border-box}.topnav{overflow:hidden;background-color:#333}.topnav a{float:left;display:block;color:#f2f2f2;text-align:center;padding:14px 16px;text-decoration:none;font-size:17px}.topnav a:hover{background-color:#ddd;color:#000}.topnav a.active{background-color:#04aa6d;color:#fff}.topnav a.right{float:right;background-color:#8a2be2}.test{background-color:red}@media screen and (max-width: 600px){.topnav a{float:none;width:100%}}