body {
    font-family: 'Helvetica', sans-serif;
    margin: 0 auto;
}

div#chart_div {
    margin: 0 auto;
    font-size: 2em;
    font-weight: bold;
}

h1 {
    text-align: center;
    padding: 20px;
    font-family: 'Helvetica', sans-serif;
    font-size: 3em;
}

h3 {
    text-align: center;
    font-size: 2em;
    color: teal;
}

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    text-align: center;
    font-size: 0.8em;
}