This example is from Ch06 Page Layout with CSS - pg 220 Practice with Normal Flow and NESTED elements. It demonstrates two "boxes" that ARE nested (e.g. one is insidethe other), and it also has a Stylesheet associated with it (coding shown below).
The CSS code used in this page is stored in a file called ch06pg219_style_v1.css, and looks like:
.div1 { width: 200px; height: 200px; background-color: #D1ECFF; border: dashed; padding: 5px; }
.div2 { width: 100px; height: 100px; background-color: #FFFFFF; border: ridge; padding: 5px; margin: 10px; }
And this is the end of the page.