In my web app the application itself will take up most of the screen estate (the pink layer in the below picture), while the about page (the blue layer) is hidden below it, thanks to
z-index. If the user clicks the about button, the pink layer will slide up, uncovering the about page. Since the about page explains the content of the page, could this affect my SEO?
I have seen websites like Spotify animate seamlessly between pages that have different URLs - could that, in case what I am currently doing is absolutely inadvisable, represent a good solution? How would I possibly approach that design practice?