img {
  max-width: 100%;
  height: auto;
  display: block; /* helps with centering */
  margin: 0 auto;
}

pre {
  background-color: #3f2559 !important;
  padding: 5px !important;
}

.language-plaintext {
  background-color: #e2e2e2 !important;
  color: #111 !important;
}