how to make font size big in html code example

Example 1: font size css

.class {
	font-size: 12px;
}

Example 2: make text bigger html5

p {
  font-size: 15px;
}

p {
  font-size: large;
}

p {
  font-size: 150%;
}

Example 3: html font size

<span style="font-size:20px;"></span>