body {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('背景うり.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
    font-family: sans-serif;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px;
    border-radius: 15px;
}

.card {
    border: 1px solid #444;
    padding: 20px;
    margin: 20px 0;
    background: rgba(255, 255, 255, 0.1);
}background: #f0fff4; border: 1px solid #ccffcc; color: #006600; }