CSS boxes are cool! You can apply "box" styles to any HTML element. In particular, you can make a paragraph into a box. Try pasting the following into an existing HTML document that has a fair amount of text in it:
<p style="width: 150px; float: right; border: 2px solid; padding: 1em"> This is some text in a sidebar paragraph. </p>Read about the CSS box properties on HTMLHelp.com at http://htmlhelp.com/reference/css/box/.
You can use CSS boxes to create "sidebars." The main text "floats" around the box.
Experiment with different box properties and see what happens. For example, try adding border-color: red blue green yellow; to the style specification and see what happens.
You might want more than one paragraph in your "sidebar." Try putting the box specifications on a <div> tag and enclosing more than one paragraph between <div> and </div>. (You should treat the <div> tag with more respect after performing this experiment.)