body {
  color: beige;
  background: #111;
  margin-bottom: 200px;
  font-family: sans-serif;
}

main {
  max-width: 55%;
  margin: auto;
}

h1 {
  text-align: center;
  color: lightgreen;
}

h2 {
  text-align: center;
  color: deeppink;
  font-size: 24pt;
  border-bottom: dashed #ddd 1px;
  max-width: 500px;
  margin: 1em auto;
}

ul.links {
  list-style: none;
}

#link_menu li {
  display: inline;
}

div.center {
  align-items: center;
  align-content: center;
  align-self: center;
  text-align: center;
}

.invert {
  filter: invert(1.0);
}

a {
  text-decoration: none;
}