@11ty/eleventy-plugin-syntaxhighlight/demo/test.css

Prism.js based syntax highlighting for Markdown, Liquid, Nunjucks, WebC, and 11ty.js templates.

.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;
}