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

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

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

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

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