body {
    background: teal;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.window {
    width: 600px;
    transform: scale(1.2);
    transform-origin: center;
}

#notice {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
    font-size: 15px;
    user-select: none;
}

#notice a {
    color: blue;
    text-decoration: underline;
}