body {
    margin: 0;
    font-family: 'Arial', sans-serif;
}

.screen-lock {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    display: none;
}

.lock-message {
    text-align: center;
    color: #000;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    font-weight: 500;
}