Classes and IDs are super easy in CSS. You're using them right now!
If you don't bother with a class or ID, an HTML element just gets the regular CSS styling for that element—or the default styling if you don't specify any particular styling on the stylesheet.
<h2 div id="intro"></div>Introduction</h2>
<h3 class="standout">Classes and IDs in CSS</h3>
<p class="standout">Classes and IDs are super easy in CSS. You're using them right now!</p>
if you want to target a id in css, you start with an number sign (#), which you do correctly:
however, if you want to target a class, start with a dot (.):
Please read this post about markdown so your code/indent will show.
I just added dot to to my css and it work
i just added dod and it work... thanks for your help