body {
    font-family: 'Arial', sans-serif;
    max-width: 750px;
    margin: 0 auto;
    padding: 30px 10px;
    font-size: 1.1em;
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

h2 {
    border-bottom: black 1px solid;
    padding-bottom: 20px;
    padding-top: 20px;
}