.code-block::before {
  content: '';
  background: #1e1e1e;
  height: 10px;
  width: 48px;
  display: block;
}

.code-block::after {
  content: '';
  background: #1e1e1e;
  height: 12px;
  width: 48px;
  display: block;
}

.code-block code .linenumber {
  margin-right: 4px;
}

.code-block code::after,
.code-block code::before {
  content: none !important;
}