.post-image {
  text-align: center;
  margin: 2em auto;
  max-width: 500px;
}

.post-image img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.post-image figcaption {
  text-align: center;
  font-style: italic;
  margin-top: 0.5em;
  font-size: 0.9em;
  color: #888;
  line-height: 1.4;
}