Bootstrap also provides some utility classes, which Bootstrap refers to as helper classes. The helper classes provide some basic styles to accentuate information on a page. Their purpose is to give the user some context to the information they are receiving and to provide the developer with styling techniques, outside of the grid system.
Bootstrap defines six context types to give a visual indicator to the user of what type of information is being conveyed: muted, primary, success, info, warning, and danger, as well as providing the developer with simple classes to assign context to elements via text color, text-<context> or background color, bg-<context>.
Let's apply some context to our example. We will add two prices to each size: a regular price and a special offer price. We will apply a success context to the special offer price and a muted context to the regular price. Print sizes with prices reduced by €10 or more will be given an info context background...