align content withPseudo-classes (#37256)

Update index.md

files/en-us/web/css/pseudo-classes/index.md

@@ -10,7 +10,7 @@ spec-urls:
 
 {{CSSRef}}
 
-A [CSS](/en-US/docs/Web/CSS) **_pseudo-class_** is a keyword added to a selector that specifies a special state of the selected element(s). For example, the pseudo-class {{CSSxRef(":hover")}} can be used to select a button when a user's pointer hovers over the button and this selected button can then be styled.
+A [CSS](/en-US/docs/Web/CSS) **_pseudo-class_** is a keyword added to a selector that lets you style a specific state of the selected element(s). For example, the pseudo-class {{CSSxRef(":hover")}} can be used to select a button when a user's pointer hovers over the button and this selected button can then be styled.
 
 ```css
 /* Any button over which the user's pointer is hovering */