.fab {
   display:none;
   width: 60px;
   height: 60px;
   background-color: #0069B4;
   border-radius: 50%;
   box-shadow: 0 6px 10px 0 #666;
   transition: all 0.1s ease-in-out;
 
   font-size: 50px;
   color: white;
   text-align: center;
   line-height: 60px;
 
   position: fixed;
   left: 30px;
   bottom: 30px;
}
 
.fab:hover {
   box-shadow: 0 6px 14px 0 #666;
   transform: scale(1.05);
}


.helper {
    display: inline-block;
    height: 100%;
    vertical-align: middle;
}

.fab img {
    vertical-align: middle;
}