GRID is made up of columns contained within a single wrapper. There is a built in mobile grid which can target smaller screens to help provide targeted grid structures for all screen sizes.
Add the scss file into your sass structure. Customise the amount of columns with the $columns variable.
Wrap your columns within a .grid container.
In the example below, .col--1 equals to 25% width within a 4 column grid structure.
<section class="grid">
<div class="col col--1 col__mob--4">
</div>
<div class="col col--2 col__mob--1">
</div>
<div class="col col--1 col__mob--3">
</div>
</section>