body {
  width: 960px;
  margin: auto;
  text-align: center;
}

.pure-form {
  width: 380px;
  margin: 24px auto;
}
.pure-form button {
  margin-top: 0.5em;
}
.pure-form input {
  margin: auto;
}

figure {
  max-width: 400px;
  margin: auto;
}
figure img {
  width: 100%;
}
figcaption {
  color: #505050;
  text-align: center;
}

pre {
  text-align: left;
}
dt {
  font-weight: bold;
  margin: 0 0 0.5em 0;
  background-color: #e8e8e8;
  padding: 2px;
}
dd {
  margin: 0 0 2em 0;
}