Classes

Bulma is a CSS framework, meaning that the end result is simply a single .css file:
https://github.com/jgthms/bulma/blob/master/css/bulma.css

Because Bulma solely comprises CSS classes, the HTML code you write has no impact on the styling of your page. That's why .input exists as a class, so you can choose which <input type="text"> elements you want to style.

Bulma only styles generic tags directly twice:

• generic.sass to define a basic style for your page
• the .content class to use for any textual content, like WYSIWYG