body {
    font-family: sans-serif;
}

header {
    text-align: center;
}

header, nav, section {
    max-width: 60rem;
    margin-left: auto;
    margin-right: auto;
    border-bottom: 1px dotted gray;
}

header, nav {
    padding-bottom: 2rem;
    margin-bottom: 2rem;
}

section {
    padding-bottom: 3rem;
    margin-top: 3rem;
    margin-bottom: 3rem;
}

nav ul {
    display: flex;
    justify-content: space-between;
    padding-left: 0;
}

nav li {
    list-style: none;

}

strong.warning {
    background-color: yellow;
    color: red;
    display: inline-block;
    padding: 1rem;
    border-radius: 1rem;
    border: dotted 2px red;
}

.lecture .date {
    font-weight: 500;
    font-style: italic;
}

table th, table td {
    border: 1px solid gray;
    vertical-align: top;
    padding: .5rem;
}

table th {
    text-align: left;
}

table p, table ul {
    margin-top: 0;
}

table .no-class td {
    background-color: gainsboro;
}

table .project td {
    background: paleturquoise;
}

dt, dd {
    display: inline-block;
}

.indent {
    padding-left: 1rem;
    border-left: 4px solid lightgray;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}