.whatsapp-button {
    position: fixed;
    width: 60px;
    height: 60px;
    right: 10px;
    bottom: 50%;
    transform: translateY(50%);
    border-radius: 0.7em;
    text-align: center;
    z-index: 100;
    background-image: url('../images/whatsapp_logo.png');
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    box-shadow: none; /* No shadow */
}

/* For medium-sized screens */
@media only screen and (max-width: 768px) {
    .whatsapp-button {
        right: 30px; /* Further from the right screen edge on medium screens */
    }
}

/* For small screens */
@media only screen and (max-width: 480px) {
    .whatsapp-button {
        right: 10px; /* Closer back on small screens */
        width: 50px;
        height: 50px;
    }
}