While working with Twitter Bootstrap, I stumbled upon an unusual issue where everything looked fine on desktop screens but appeared differently on Samsung Galaxy S5 or displays of similar sizes (360 x 640 or 640 x 360 in this case). There was a strange right margin that I couldn't seem to eliminate. https://i.sstatic.net/BNMAc.png
Interestingly, the body element scaled correctly.
This screen capture was taken in the Chrome browser. You can check out the live code at: