A class attribute applies a reusable CSS style to an HTML element. Instead of repeating every style property, add the class name, such as greensans, to the element. section 7.6
Define the class in the Additional CSS screen, then add class="greensans" to each heading, paragraph, or other element that should share the style. Changing the class definition updates every matching element. section 7.6
Reuse one style
A .greensans rule can set green text and a sans-serif font. Apply it to multiple h1 elements and a paragraph with class="greensans".
