Body width increases when modal is opened

When the modal is open, it applies the "modal-open" class to the body tag. The "overflow:hidden" style makes the body width to increase. 
If you have some horizontal centered content it moves a bit to the right, and back to the left when you close the modal.
I tried it in the demo page and the same happened. 
Is there any way to avoid this?

Only tested in Chrome.
