This is bootstrap structure you fucking knuckle head. Google grid-container and other divs and structure styles in the view source of the site.
I have a site that uses bootstrap.. its a great rapid app dev tool for sites. And themes make development easy. But i don't pretend i don't use it.
Try again.... do your research its bootstrap durrrr not a custom site unless you mean taking bootstrap and then adding a theme and some meta data that makes it custom...
incase you want some more proof because you're a moron
But hey maybe they have a custom site that uses the bootstrap.min cascading style sheet right... do you even read the shit you write?