body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #222;
    color: #eee;
    font-family: Arial, sans-serif;
}

h1 {
    margin-bottom: 20px;
}

video {
    display: none; /* ビデオ要素は非表示にし、canvasに描画 */
}

canvas {
    max-width: 100%;
    height: auto;
    border: 2px solid #555;
    background-color: #000;
}