.nav{position:fixed;bottom:0;width:100%;background:#111;display:flex;justify-content:space-around;padding:12px;}
.nav a{color:#fff;font-size:20px;text-decoration:none;}
.install{position:fixed;bottom:70px;left:20px;background:#000;color:#fff;padding:10px;border-radius:20px;}
.dark{background:#000;color:#fff;}