Default Styles: Fix typo (#28650)

intermediate_html_css/intermediate_css_concepts/default_styles.md

@@ -11,7 +11,7 @@ This section contains a general overview of topics that you will learn in this l
 
 ### What are default styles and where do they come from?
 
-As you have worked on projects, you likely observed default styles applied to certain elements, such as larger and bolder headings on `h1` elements, and blue, underlined links on `a' elements. There is also a good chance you struggled with things like default margins and padding. These styles are part of the user-agent stylesheets, ensuring basic styling for webpages without CSS. Each browser has its own set of user-agent stylesheets so the default styles do vary slightly between browsers.
+As you have worked on projects, you likely observed default styles applied to certain elements, such as larger and bolder headings on `h1` elements, and blue, underlined links on `a` elements. There is also a good chance you struggled with things like default margins and padding. These styles are part of the user-agent stylesheets, ensuring basic styling for webpages without CSS. Each browser has its own set of user-agent stylesheets so the default styles do vary slightly between browsers.
 
 ### What if I don't like the defaults?