main {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: left;
}
nav {
    width: 15%;
    min-width: 300px;
    padding: 10px;
    background-color: lightblue;
}
article {
    width: 85%;
    padding: 10px;
}
footer {
    text-align: right;
    padding: 10px;
}
ul {
    margin-left: 30px;
    margin-top: 5px;
    margin-bottom: 5px;
    padding-left: 0;
}
.ul-none {
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}
ol {
    margin-left: 10px;
    padding-left: 0;
}
li {
    font-size: large;
    padding: 5px;
}
.li-nav {
    font-size: large;
    padding: 0;
}
h1 {
    color:darkslateblue;
    font-size:xx-large;
    margin-bottom: 5px;
}
h2 {
    margin-bottom: 5px;
}
h3 {
    margin-bottom: 5px;
}
section {
    text-align: justify;
    font-size: large;
    padding: 5px;
}
code {
    color: cornflowerblue;
    font-size: large;
    white-space: pre-wrap;
}
em-comment {
    color: green;
}
em-tex {
    font-style: italic;
}
hint-tex {
    color: darkgray;
}
red {
    color: red;
}