eleventy-plugin-syntaxhighlighting-chroma/demo/test.css

.highlight-line {
  display: inline-block;
}

/* allow highlighting empty lines */
.highlight-line:empty:before {
  content: " ";
}

.highlight-line:not(:last-child) {
  min-width: 100%;
}
.highlight-line .highlight-line:not(:last-child) {
  min-width: 0;
}

pre {
  display: block;
  padding: 0.75rem 1rem;
  line-height: 1.5;

  overflow-x: auto;
  background-color: #eee;
  font-size: 1em; /*14px /16*/
  -moz-tab-size: 2;
  -o-tab-size: 2;
  tab-size: 2;

  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;

  background-color: #272822;
  color: #fff;
}