html, body {
    position: relative;
    height: 100%;
}

body {
    position: fixed;
    margin: 0px;
    overflow: hidden;
    background-color: #000000;
}

#notice {
    position: fixed;
    display: inline-block;
    white-space: nowrap;
    font-family: sans-serif;
    font-size: calc(5vw);
    font-weight: bold;
    color: rgba(255, 255, 255, 0.70);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

@media screen and (orientation: landscape) {
    #notice {
        position: fixed;
        display: inline-block;
        white-space: nowrap;
        font-family: sans-serif;
        font-size: calc(3vw);
        font-weight: bold;
        color: rgba(255, 255, 255, 0.70);
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 1;
    }
}