adding informal text in example

Author: howcome

css-gcpm/Overview.src.html

@@ -3603,13 +3603,18 @@ <h3>Selecting elements within pages and columns</h3>
 
 ::page(left) p { text-align: left }
 </pre>
-</div>
 
 <p class=issue>Is "left" a pseudo-class or pseudo-element? In @page, ":left" is a pseudo-class. However, when we select elements on left pages, it acts like a pseudo-element.</p>
 
+</div>
+
+
+
 </div>
 
 <div class=example>
+<p>This syntax also allows the selection and styling of elements inside margin boxes:
+
 <pre>
 @page :left {
   background: pink;            /* declaration applies to pages */