body {
    font-family: Arial, sans-serif;
    background: #f1f2f6;
    margin: 0;
    padding: 0;
}

header {
    background: #2d3436;
    color: white;
    padding: 1em;
    text-align: center;
}

main {
    padding: 1em;
}

form input, form button {
    display: block;
    padding: 0.5em;
    margin: 0.5em 0;
    width: 100%;
    max-width: 300px;
}