#whatsapp {
    position: fixed;
    left: 30px;
    bottom: 15px;
    background-color: #53cb60;
    z-index: 500;
    color: #FFF;
    padding: 8px 10px;
    border-radius: 20px;
}
#whatsapp img { width: 32px; }
@media (max-width: 600px){
    #whatsapp {
        font-size: 13px;
    }
    #whatsapp img { width: 24px; }
}
.whatsapp{
    color: #fff;
    }