body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #24292e;
    margin-bottom: 10px;
}

button {
    background-color: #2ea44f;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 20px;
    transition: background 0.2s;
}

button:hover {
    background-color: #2c974b;
}