That's just straight up HTML. That being said, you should be able to edit the parameters for the image size as a percentage, or by pixel size.
Example: src="" width="125%" height="125%">
Example: src="" width="600px" height="600px"
This may or may not work depending on parameters set in CSS. This way you could tweak the size of the image to exactly what you wanted it. Percentages give you the most control, but pixel based dimensions are good too.
I used to be a web designer, so I understand this stuff. Will have to test it out myself. I'm new here, so haven't done any videos yet though
Most sensible thing I've seen in the comments here. I agree and it's a matter of the Steemit.com and d.tube creators coming to a consensus of how they share their css. I think it's a simple solution like you've mentioned and them getting together on that. I think this will be fixed really quick though.. I hope. :)
I just tested it, and it appears we're locked out from editing the actual HTML :( Was worth a try though. Apparently the size is statically set in CSS, which we don't have access to. Would be cool if they could come up with a way to resize, or enter parameters ourselves.