#chat-button {
    position: fixed;
    bottom: 90px;
    right: 10px;
    z-index: 9999;
    background-color: transparent;
    padding: 0;
    text-align: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#chat-button.show {
    opacity: 1;
    visibility: visible;
}

#chat-button:hover {
    transform: scale(1.1);
}

#chat-button img {
    width: 70px;
    height: 70px;
    display: block;
    background-color: transparent;
    border: none;
    filter: drop-shadow(0 0 1px #888) drop-shadow(0 0 2px #fff);
}

@media (max-width: 768px) {
    #chat-button img {
        width: 60px;
        height: 60px;
    }
}