body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
}
header, footer {
    background: #004d40;
    color: #fff;
    padding: 1em;
}
main {
    padding: 1em;
}
.logo h1 {
    margin: 0;
}
nav ul {
    list-style: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin-right: 10px;
}