Hover to Reveal Icon 

/* ===== Button 21 ===== */

.btn-icon-reveal  {
    white-space: nowrap;
}

.btn-icon-reveal i {
   opacity: 0;
   margin-right: -20px;
   width: 15px;
   transition: .3s;
}

.btn-icon-reveal:hover i {
    opacity: 1;
    margin-right: 0px;
    transform: translatex(5px);
}