Example post
css and categories

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font: 100%/1.6 sans-serif;
  margin: 0 auto;
  padding: 1em;
}

@media (min-width: 768px) {
  html {
    font-size: 125%;
    max-width: 42em;
  }
}

h1, h2, h3, h4 {
  margin: 2.5rem 0 1.5rem 0;
  line-height: 1.25;
}

.subtitle {
  font-weight: normal;
  font-size: 0.8em;
  color: #555;
}

.underline {
  text-decoration: underline;
}

p {
  margin: 1em 0;
}

ol, ul {
  margin: 1em;
}

li > ol, li > ul {
  margin: 0 2em;
}

img {
  max-width: 100%;
  display: block;
  margin: 0 auto;
}

caption, .figure {
  font-family: monospace;
  font-size: 0.8em;
  padding: 0.5em;
}

blockquote {
  padding-left: 2em;
  font-style: italic;
}

table, table * {
  border: none;
}

table {
  font-family: monospace;
  font-size: 1rem;
  text-align: left;
  caption-side: bottom;
}

table tbody {
  display: block;
  max-height: 70vh;
  overflow-y: auto;
}

table thead, table tr {
  display: table;
  table-layout: fixed;
  width: 100%;
}

table td, table th {
  padding: 0.3em;
}

table tr:nth-child(even) {
  background-color: #f3f3f3;
}

code {
  padding: 0.05em 0.2em;
  border: 1px solid #ccc;
}

table, pre.src, pre.example {
  max-height: 70vh;
  margin: 1em 0;
  padding: 1em;
  overflow: auto;
  font-size: 0.85rem;
}

pre.src, pre.example {
  color: #dcdccc;
  background-color: #3f3f3f;
}

.coderef-off:target {
  background: rgba(100,100,100,0.5);
}

.footdef sup {
  float: left;
}

.footdef > .footpara {
  padding-left: 1.5rem;
}

.categories {
  margin-top: -1.5rem;
}

.categories li {
  display: inline;
  margin-right: 0.5em;
}

/* Components */

/* Header */

header {
  display: flex;
  justify-content: space-between;
}

header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header a {
  text-decoration: none;
}

header a + a {
  margin-left: 1rem;
}

/* Index (not org mode related) */

.index {
  margin: 0;
  list-style: none;
}

.index date {
  font-family: monospace;
  font-size: 0.8rem;
  vertical-align: middle;
  padding-right: 2rem;
  color: grey;
}

.index a {
  display: block;
  text-decoration: none;
  padding: 0.5em 0;
  color: black;
}

.index a:hover, a:focus, a:active {
  text-decoration: none;
  background: rgba(200,200,200,0.2);
}