@media (min-width: 768px) {
    body {
        column-count: 2;
    }
}
@media (min-width: 1152px) {
    body {
        column-count: 3;
    }
}

body {
    font-family: Georgia, serif;
    line-height: 1.5;
    margin-left: 2em;
    margin-right: 2em;
    background: #ffffe1;
    column-gap: 4em;
}
p {
    text-align: justify;
}
pre {
    color: black;
    background: #ffe;
    overflow: auto;
    padding: 0.2em 0.5em;
    border: 1px solid silver;
}
nav {
    clear: both;
}
nav ul {
    list-style: none;
    padding-left: 0;
    text-align: left;
}
nav ul ul {
    font-size: small;
    padding-left: 1em;
}

.logo {
    float: left;
    margin-right: 1em;
}
.important {
    font-weight: bold;
}