#footer {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    bottom: 20px;
    right: 20px;
}

.whatsapp-button {
    background: linear-gradient(to bottom, #25d366, #128c7e);
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.2);
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
}

.whatsapp-button:hover {
    opacity: 0.8;
}

.whatsapp-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-image: url('caminho-para-o-icone-whatsapp.png');
    background-size: cover;
    margin-right: 10px;
}

@media (max-width: 768px) {
    .whatsapp-button {
        position: fixed;
        bottom: 0.5%;
        /* move o botão 10% para cima */
        left: 0;
        width: 95%;
        height: 40px;
        background: linear-gradient(to bottom, #25d366, #128c7e);
        color: #fff;
        padding: 5px 10px;
        border: none;
        border-radius: 50px;
        text-decoration: none;
        font-weight: bold;
        box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.2);
        transition: opacity 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
    }

    .whatsapp-button:hover {
        opacity: 0.8;
    }
}