Video embed in product page get shrunk

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Hi! I'm trying to insert a video on my product page, the video is on vimeo and I used the embed code provided and followed the instruction on the shopify page, however the video appears on the page with a very small size, half the size of the images uploaded on the same page.  I tried to change the size of the video and the thumbnail to no avail.
Previously I had placed a video on a different page (not product page) and had no problems.