html {
    background:#f9f9f9;
}

body {
    background: #fff;
    border: 1px solid lightgrey;
    margin: 1em auto;
    max-width: 75ch;
    padding: 10px;
    line-height: 1.4;
}

p code, li code {
    border: 1px solid brown;
    border-radius: 2px;
    color: brown;
    padding: 1px 2px;
}

img {
    height: auto;
    max-width: 100%;
}

pre {
    background: #f9f9f9;
    border: 1px solid lightgrey;
    padding: 5px;
}

#TOC {
    border: 1px solid;
    position: relative;
}
#TOC:before {
    border-bottom: 1px solid;
    content: 'Table of Contents';
    display: block;
    font-weight: bold;
    padding: 5px;
    position: relative;
}

.date {
    color: grey;
}