body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #ffffff;
    color: #000000;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

main p {
    font-size: 1.2em;
    margin-bottom: 40px;
}

/* ボタン */
.buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
    margin-bottom: 30px;
}

button {
    padding: 15px 30px;
    font-size: 1em;
    cursor: pointer;
    border: 2px solid #000;
    background-color: #fff;
    color: #000;
    transition: 0.3s;
}

button:disabled {
    background-color: #ccc;
    color: #666;
    cursor:
::contentReference[oaicite:0]{index=0}