div.main li {
    padding-bottom: 0.1em;
    padding-top: 0.4em;
}

div.main code {
    font-size: large;
    padding-left: 2px;
    padding-right: 2px;
    background: #fefefe;
    border: 1px black solid;
    border-radius: 5px;
}

span.question {
    font-weight: bold;
    font-style: italic;
}

img.play-button {
    height: 2em;
    width: 2em;
}