body {
    font-family: Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Constantia, Georgia, serif !important;
    max-width: 7in;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 5in;
    padding: 1em;
    line-height: 1.25em;
}

heading {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
}

code {
    color: brown;
}

h2,p {
    margin-bottom: 0;
}

td {
    padding-bottom: 1em;
}

li {
    list-style-type: none;
    margin-bottom: 0.5em;
}

input[type="checkbox"] {
    margin-right: 0.5em;
}

pre {
    color: purple;
}

footer {
    color: gray;
    font-size: smaller;
    margin-top: 5em;
    text-align: right;
}
footer a {
    color: inherit;
}

.explanation {
    font-size: larger;
}
.horizontal-group {
    display: flex;
    flex-direction: row;
}

/* rules to put the footer at the bottom of the page */

body {
    margin-top: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
footer {
    flex-grow: 1000;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}
footer .line-above {
    display: inline-block;
    border-top: 1px solid lightgray;
    padding-top: 0.5em;
    margin-bottom: 1em;
}