body {
    background: #0d1117;
    color: #fff;
    font-family: Arial, sans-serif;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #58a6ff;
}

.card {
    background: #161b22;
    padding: 20px;
    margin: 15px 0;
    border-radius: 8px;
    border: 1px solid #30363d;
}

.btn {
    display: inline-block;
    background: #238636;
    color: white;
    padding: 10px 15px;
    margin-top: 10px;
    border-radius: 5px;
    text-decoration: none;
}