Often we can improve the user experience by grouping related fields, such as first and last name. In these cases, it's appropriate to include
<fieldset>. We'll first learn how to semantically create the fieldset HTML. Then, we'll set up a series of scalable classes that are flexible for various layout configurations. The layout classes will also be intrinsically responsive - meaning, they will respond to their parent container or the viewport without the use of media queries!