* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f7f7f7;
    color: #222;
}

header {
    padding: 3rem 2rem;
    text-align: center;
    background: #222;
    color: white;
}

header h1 {
    margin-bottom: 0.25rem;
}

main {
    width: min(900px, 90%);
    margin: 2rem auto;
}

section {
    background: white;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    border-radius: 8px;
}

a {
    color: #315ca8;
}

a:hover {
    text-decoration: none;
}

footer {
    text-align: center;
    padding: 2rem;
}