.imgAdmin, .imgModerator, .imgUser {
  height: 45px;
  width: 100%;
  max-width: 120px;
  text-indent: -10000em;
  background-size: contain;
  -webkit-background-size: contain;
  -moz-background-size: contain;
  -o-background-size: contain;
}

.imgAdmin {
  background: url(/images/img_admin.png) no-repeat;
}

.imgModerator {
  background: url(/images/img_moderator.png) no-repeat;
}

.imgUser {
  background: url(/images/img_user.png) no-repeat;
}