how to increase text size in html using css code example

Example 1: text size in CSS

font-size: 2em;

Example 2: how to change text size in css

.class{
  	font-size: 100%;
}

.class{
  	font-size: 20em;
}

.class{
  	font-size: 20px;
}

.class{
  	font-size: 20pt:
}