Update content/blog/2026/poetic-css-intro.md

Co-authored-by: david herron <41588129+dvdherron@users.noreply.github.com>

Author: mirisuzanne

content/blog/2026/poetic-css-intro.md

@@ -33,7 +33,7 @@ But this course is all about systems:
 - Building our own systems to efficiently work with CSS
 
 We'll cover individual features
-like flexbox and grid and container queries,
+like flexbox, grid, and container queries,
 but we'll also re-visit
 underlying principles like inheritance,
 the cascade, and value resolution.