give class primary usage css code example
Example 1: how to make a class in html
<ul class="legend">
<li><span class="greendot"></span>Text</li><br></br>
<li><span class="yellowdot"></span>Text</li><br></br>
<li><span class="reddot"></span>Text</li><br></br>
<li><span class="blackdot"></span>Text</li><br></br>
</ul>
Example 2: html specific class color
<!-- in the head element -->
<style> h1 { color:blue; } </style>
<!-- in the body element -->
<h1> text in blue because all "h1" element is in blue </h1>