body { padding: 0; margin: 0; } img { vertical-align: middle; } a { text-decoration: none; } .button { display: block; background: #eee; margin: 0; padding: 10px; } .button:hover { background: #ddd; } .centered { position: fixed; top: 50%; left: 50%; /* bring your own prefixes */ transform: translate(-50%, -50%); } .img-circle { border-radius: 50%; } .send-channel { margin-left: 30px; } #content { margin: 10px, 0 auto; line-height: 1.5em; width: 70%; }