Question: is there already built-in settings to have the Add to Cart Box float at the top of the page of the mobile menu (in vertical/portrait orientation)?
If the phone is sideways (landscape mode), it's perfect because the Add to Cart Box floats on the right side of the screen.
But if the phone is in vertical/portrait mode, the Add to Cart Box is at the very bottom of the product page. I am getting a lot of customers who think the product is available and asking questions, because they aren't scrolling to the very bottom and seeing that it's out of stock or discontinued.
Just wondering if that functionality already exists (to both display the Add to Cart box near the top of the product description when in vertical screen orientation), or if it's something I can add through CSS (making a block of code hidden or visible depending on the size of the display, etc).

Bookmarks