Removed and optimised the styles to limit duplicates and gave elements a block display to make sure centering and image sizes act like they should.
Move all video related code on to the video tag.
Images are probably best at `max-width:100%; to prevent them looking too small on devices, such as iPad Mini.
Previously, the global video element was styled to make it look better on the stand alone page. However; the class `.show-asset-light` is the video skin class assigned to the stand alone page only.
Based on this, I have optimised the style on this class and removed parts no longer needed from the `video-player` class, thereby not affecting any other pages for areas only required on the stand alone page.
