body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 400px;
}

#css-status {
    color: #2ecc71;
    font-weight: bold;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 15px;
    transition: background 0.2s;
}

button:hover {
    background-color: #2980b9;
}

.hidden {
    display: none;
}

#js-status {
    color: #3498db;
    font-weight: bold;
    margin-top: 15px;
}