body {
  background-color: #FFF;
  color: #000;
  font-weight: bold;
  font-size: small;
}

a {
  color: #000;
}

a:hover {
  color: grey;  
}

p,
pre {
  text-align: left;
  margin: 0.5em auto;
  max-width: 600px;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

.gallery-container a > img {
  width: 30%;
}