#mb-us-switch-back-btn {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 9999;
    background: #0073aa;
    color: #fff;
    padding: 10px 15px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

#mb-us-switch-back-btn:hover {
    background: #005177;
}