body {
  font-family: Helvetica, arial, freesans, clean, sans-serif;
  line-height: 1.4;
  max-width: 48em;
  margin: auto;
  color: #333333;
  background-color: #fff;
  font-size: 13pt;
}

div#banner {
  margin: 1em 0 0 0;
  display: flex;
  align-items: center;
}

div#banner div {
  display: flex;
  justify-content: center;
  flex: 1;
}

div#banner img {
  max-width: 300px;
}

nav ul {
  padding: 0;
  display: flex;
  list-style: none;
  justify-content: space-between;
}

header {
  border-bottom: 1px solid gray;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

header h1 { margin: 0.1em; }

header h2 { margin: 0; font-size: 70%; margin-right: 1em; }

h1 { font-size: 140%; font-weight: bold; padding-top: 0.5em; }

h2 { font-size: 120%; font-weight: bold; }

h3 { font-size: 110%; font-weight: bold; }

h4 { font-size: 100%; font-weight: bold; }

pre {
  display: block;
  overflow: auto;
  -ms-word-wrap: normal;
  word-wrap: normal;
  overflow-wrap: normal;
  white-space: pre;
  max-height: 24em;
  max-width: 623px;
}

.site {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.wrap {
  flex: 1;
}

.site-content {
  display: flex;
}

.content {
  flex: 1;
}

main ul {
  list-style: none;
}

aside {
  border-left: 1px dashed black;
  flex: 0 0 12em;
}

aside ul {
  list-style: none;
}

footer {
  display: flex;
  justify-content: center;
}

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