.contact-buttons {
    display: flex;
    flex-direction: column;
    position: fixed;
    bottom: 5rem;
    right: 20px;
    z-index: 9999;
}

.phone-btn,
.zalo-btn {
    margin-bottom: 10px;
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    transition: all 0.4s;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.phone-btn {
    background-image: url("../img/phone.png");
    background-size: contain;
}

.zalo-btn {
    background-image: url("../img/7044033_zalo_icon.png");
    background-size: cover;

}

.zalo-icon {
    width: 30px;
    transition: transform 0.3s;
}

.zalo-btn:hover .zalo-icon {
    transform: scale(1.1);
    /* Phóng to icon khi hover */
}