Morning, idk if that Theme use Bootstrap, but I think so.
This is a grid example using bootstrap, https://getbootstrap.com/examples/grid/
Here is a good explanation of the sizes : http://stackoverflow.com/questions/24175998/meaning-of-numbers-in-col-md-4-col-xs-1-col-lg-2-in-bootstrap, basically, you always have 12 that you can box.
You can also look at the source on this site in https://www.php-fusion.co.uk/downloads.php it is pretty segmented.
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