/* 全体の設定 */
body {
    margin: 0;
    padding: 0;
    background-color: #000;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #fff;
}

.container {
    text-align: center;
    border: 2px solid #fff;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(255, 255, 255, 0.1);
    background-color: rgba(0, 0, 0, 0.7);
}

h1 {
    font-size: 3em;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

p {
    font-size: 1.2em;
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    font-size: 1em;
    background-color: #444;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #666;
}