body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f7f7f7;
    margin: 0;
    padding: 0;
}
header, nav, footer {
    background-color: #004466;
    color: white;
    padding: 1em;
}
nav a {
    color: white;
    margin-right: 1em;
    text-decoration: none;
}
main {
    padding: 2em;
    background: white;
    max-width: 900px;
    margin: auto;
}
h1, h2 {
    color: #004466;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1em 0;
}