.whatsapp-float {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 20px;
    right: 20px;
    background-color: #25d366;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 30px;
    z-index: 100;
    box-shadow: 2px 2px 3px #999;
}

.whatsapp-float img {
    width: 100%;
    height: 100%;
    padding: 10px;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    transition: transform 0.2s;
}

@media only screen and (max-width: 768px) {
    .whatsapp-float {
        width: 50px;
        height: 50px;
        bottom: 15px;
        right: 15px;
    }
}