Update index.md

files/en-us/web/css/@charset/index.md

@@ -26,12 +26,14 @@ As there are several ways to define the character encoding of a style sheet, the
 @charset "iso-8859-15";
 ```
 
-- _charset_
-  - : A {{cssxref("<string>")}} denoting the character encoding to be used. It must be the name of a web-safe character encoding defined in the [IANA-registry](https://www.iana.org/assignments/character-sets/character-sets.xhtml), and must be double-quoted, following exactly one space character (U+0020), and immediately terminated with a semicolon. If several names are associated with an encoding, only the one marked with _preferred_ must be used.
+### Formal syntax
 
-## Formal syntax
+```plain
+@charset "<charset>";
+```
 
-{{csssyntax}}
+- _charset_
+  - : A {{cssxref("&lt;string&gt;")}} denoting the character encoding to be used. It must be the name of a web-safe character encoding defined in the [IANA-registry](https://www.iana.org/assignments/character-sets/character-sets.xhtml), and must be double-quoted, following exactly one space character (U+0020), and immediately terminated with a semicolon. If several names are associated with an encoding, only the one marked with _preferred_ must be used.
 
 ## Examples