how to change the font size in css code example

Example 1: font size css

.class {
	font-size: 12px;
}

Example 2: html font size

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

Example 3: text size in CSS

font-size: 2em;

Example 4: css font size

// to scale font size in relation to its parent element
style="font-size: 2vw;"