p.caption {
  color: #777;
  margin-top: 10px;
}
p code {
  white-space: inherit;
}
pre {
  word-break: normal;
  word-wrap: normal;
}
pre code {
  white-space: inherit;
}

.bkg-que {
  background-color: #f7f7f7; /* very light gray */
  border-left: 4px solid #bbb;
  padding: 1em;
  margin: 1em 0;
}

.bkg-ans {
  background-color: #e0e0e0; /* medium light gray */
  border-left: 4px solid #888;
  padding: 1em;
  margin: 1em 0;
}