.call-btn{
    position: fixed;
    right: 10px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    background: #28a745;
    border-radius: 50%;
    display:flex;
    justify-content:center;
    align-items:center;
    color:#fff;
    text-decoration:none;
    font-size:30px;
    box-shadow:0 4px 10px rgba(0,0,0,.3);
    z-index:999999;
    transition:.3s;
}

.call-btn:hover{
    transform:scale(1.1);
}