ECOM-811 design and layout changes

@wedaly @stephensanchez @rlucioni here are the style and text updates. Unfortunately I had to use teh dreaded !important in my Sass to override some ridiculously specific selectors, but after the A/B test we can clean this up by removing the legacy styles.
Should this be capitalized? "Review Your Info"

The reason I'm concerned about this is that it causes a bunch of extra work for our translators to merge strings to master, then change them a few weeks on.