Lightweight Grid Columns are super easy to use! Install and activate the plugin, then look for the columns icon within your TinyMCE toolbar (see screenshots).

Specify your desired desktop, tablet and mobile widths of the columns, add your content and then insert your shortcode into your content.

Lightweight Grid Columns uses the awesome Unsemantic Framework: (http://unsemantic.com/)

Check out GeneratePress, our awesome WordPress theme! (https://wordpress.org/themes/generatepress)

Features include:

Desktop grid width
Tablet grid width
Mobile grid width
Add custom classes
Add custom inline styles
Equal height columns