.icon--lock:before,
.icon--lock { background-image: url('png/lock.png'); background-repeat: no-repeat; }

.icon--penrose:before,
.icon--penrose { background-image: url('png/penrose.png'); background-repeat: no-repeat; }

.headline--wavy:after,
.site-footer:before,
.icon--waves:before,
.icon--waves { background-image: url('png/waves.png'); background-repeat: no-repeat; }