body {
  display: flex;
  flex-flow: row wrap;
}

main {
  flex: 3 1 0%;
  text-align: justify;
}

header, nav, footer {
  flex: 1 100%;
}

header {
  display: flex;
  align-items: center;
  height: 5vh;
  border-bottom: 2px solid rgba(0,200,100,128);
  padding: 0 1em;
}

header img {
  height: 4vh;
}

header em {
  font-weight: bold;
  font-style: italic;
  font-size: 4vh;
  flex-grow: 1;
  text-align: center;
}

footer {
  text-align: center;
  font-size: small;
  color: gray;
}

/* Navigation sidebar */

aside {
  flex: 1 1 0%;
  padding-left: 10px;
  padding-right: 10px;
  margin-right: 10px;
}

nav ul {
  list-style-type: none;
  padding: 0;
  margin-left: 0em;
}

nav ul ul {
  margin-left: 1.5em;
}

nav > ul > li {
  font-weight: bold;
  font-style: italic;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  border-bottom: 1px solid lightgray;
}

nav > ul > ul > li {
  list-style-type: square;
  padding: 3px;
}

/* Content */

a {
  text-decoration: none;
  color: rgb(0,150,100);
}

code.hljs {
  margin-left: 2em;
  background-color: #f0f0f0;
}