.whatsapp-button{
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background-color: #25D366;
    width: 3.75rem;
    height: 3.75rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;

    cursor: pointer;
    z-index: 9999;

    box-shadow: 0 4px 10px rgba(0,0,0,0.2);

    transition: 
        background-color .2s ease,
        transform .2s ease,
        box-shadow .2s ease;

    will-change: transform;
}

.whatsapp-button:hover{
    background-color: #25d365d8;
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 8px 18px rgba(0,0,0,0.25);
}

.whatsapp-button:active{
    transform: scale(0.95);
    box-shadow: 0 3px 6px rgba(0,0,0,0.2);
}