How to include multiple CSS sources in a compiled single CSS file (for example, resets, base styles, project-specific styles) using Liquid includes in Jekyll.

jekyll-css-yaml-includes.css

---
# No YAML required. Blank front matter so that CSS files can be included via Liquid templating.
# Make sure that the breaks are included at the start of the file so that Jekyll knows to process the Liquid includes.
---

{% include reset.css %}
{% include base.css %}
{% include project.css %}