class for css means code example

Example 1: css class

.myclass {
  border:1px solid black;
  background-color: #d2d2d2;
  height:20px;
  width:60px;
}
/*If you give this class to a div in html, it will get the styles you gave
to that class. You can add multiple classes to a div, and multiple divs
can get that class. */
/* I hope I helped! */

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>