Desktop first site using html, css and vanilla javascript

This is my first attempt writing unguided HTML/CSS. Next project I will be sure to use mobile first development. Starting with desktop first lead to messier css.

I am curious if there is a best practice for building out the content section of this landing page. I chose to use three 1X2 grids, as it was easy to make sure that they maintained the same width (rather than flexbox). Is there a better way to accomplish this? Is it more efficient to use a single grid that contains all of the content?

Ignore the "Start for Free" button that has wrapped text. I believe this is a bug with the screen capture - it does appears as it should on the actual site.