diff --git a/css-sass/introduction.md b/css-sass/introduction.md
index e69de29..8cbb7f8 100644
--- a/css-sass/introduction.md
+++ b/css-sass/introduction.md
@@ -0,0 +1,11 @@
+# Block vs Inline
+
+Below, 'some text' is actually inline, but unstylable.
+
+```
+<div>
+	Some text
+	<div>Nested text</div>
+	<span>More text</span>
+</div>
+```