.btn-whatsapp {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 25px;
    right: 25px;
    background-color: #25d366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0px 4px 12px rgba(0,0,0,0.25);
    transition: transform 0.2s ease;
    z-index: 9999;
}

.btn-whatsapp img {
    width: 35px;
    height: 35px;
}

.btn-whatsapp:hover {
    transform: scale(1.1);
}

/* Responsive */
@media (max-width: 768px) {
    .btn-whatsapp {
        width: 55px;
        height: 55px;
        bottom: 20px;
        right: 20px;
    }
    
    .btn-whatsapp img {
        width: 32px;
        height: 32px;
    }
}

@media (max-width: 480px) {
    .btn-whatsapp {
        width: 50px;
        height: 50px;
        bottom: 15px;
        right: 15px;
    }
    
    .btn-whatsapp img {
        width: 28px;
        height: 28px;
    }
}