body {
    font-family: Arial, Helvetica, sans-serif;
}

.header {
    background-image: url('/img/nttc-banner.gif');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 120px;
    width: 80%;
    margin-left: auto;
    margin-right: auto;
}

main {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
}