body {
    font-family: sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

h1 {
    color: #2c3e50;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

code, php-output {
    font-family: monospace;
    background: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    border: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}