prevent page jerking due to scrollbars

[cornernote]

Puts the overflow: hidden; onto the html element instead of the body.

[cornernote]

NOTE: this only fixes it when the page has enough content that it requires a scrollbar, it causes jerking if the content all fits onto a single page... not sure what to do here...

[cornernote]

I found a different method to solve this, seems to work no matter if the page already has overflowing content or not...

body {
    margin: 0 !important;
}
.modal-open {
    overflow: visible !important;
}

It's based on a fix for fancybox2:
http://stackoverflow.com/questions/14387524/fancybox-2-scrollbar-disapears-and-site-shifts-to-the-right

May want to add something to the docs about this, apart from that this issue can be closed.