diff --git a/guide/english/css/class-selector/index.md b/guide/english/css/class-selector/index.md
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--- a/guide/english/css/class-selector/index.md
+++ b/guide/english/css/class-selector/index.md
@@ -2,7 +2,7 @@
 title: Class Selector
 ---
 ## Class Selector
-A Class Selector is used in a CSS file to apply style to the HTML elements with the corresponding class name. In HTML, you can set the class name for any element by adding a "class" attribute.
+A Class Selector is used in a CSS file to apply style to the HTML elements with the corresponding class name. In HTML, you can set the class name for any element by adding a `class` attribute.
 
 To select elements with a specific class, we use a (.) named as period character, with the name of the class.