.scf-wrap{position:fixed;bottom:5px;z-index:9999}
.scf-btn{width:40px;height:40px;border-radius:50%;margin-bottom:15px;display:flex;align-items:center;justify-content:center;position:relative}
.scf-btn img{width:25px;z-index:3; position: relative; top: 1px;}
.scf-btn {
    box-shadow: 0 6px 18px rgba(0, 0, 0, .18);
}
.scf-btn span{position:absolute;width:100%;height:100%;border-radius:50%;animation:scf-wave 1.8s infinite}
.scf-btn span:nth-child(2){animation-delay:.6s}
.scf-btn span:nth-child(3){animation-delay:1.2s}
.scf-zalo{background:#1e88e5}
.scf-zalo span{background:rgb(0, 136, 255)}
.scf-phone{background:#e53935}
.scf-phone span{background:rgb(255, 4, 0)}
@keyframes scf-wave{0%{transform:scale(1);opacity:.45}100%{transform:scale(1.8);opacity:0}}
@media(max-width:768px){
    .scf-wrap{
        bottom: 5px;
    }
}