.features{display:flex;justify-content:space-around;padding:2rem 1rem;flex-wrap:wrap;}
.feature{width:30%;margin:1rem 0;text-align:center;}
@media(max-width:768px){.feature{width:100%;}}
#gotoTop{position:fixed;bottom:20px;right:20px;display:none;background:#333;color:#fff;border:none;padding:0.7rem 1.1rem;cursor:pointer;border-radius:4px;font-size:1.2rem;}
body.dark #gotoTop{background:#555;}