h2 {
    font-size: 1.2em;
    margin-bottom: 0.5em;
}

div.required, div.question, div.note, div.old {
    width: 80%;
    align: center;
    padding-left: 1em;
    padding-right: 1em;
    margin: 1em auto 1em auto;
}

div.required {
    background-color: #e0e0ff;
    border: 1px solid #c0c0ff;
}

div.question {
    background-color: #e0e0ff;
    border: 1px solid #c0c0ff;
}

div.note {
    background-color: #ffffb0;
    border: 1px solid #ffff80;
}

div.old {
    background-color: #ffe0e0;
    border: 1px solid #ffc0c0;
    text-align: center;
    padding: 1em;
}

div.old:before {
    content: "This homework has not been updated for 2011.  Use it for reference only.";
}