Gelbooru Size WebM in View

By default, Gelbooru shows highres videos extremely large, often beyond the scope of the page. You should never have to scroll the page just to see the video, especially to see the fullscreen button (which is always necessary to click in these cases as-is). With this, the fullscreen button will always be in view the moment you arrive on the page, and clicking it won't be a requirement to see the whole video either. Win-win.