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You can place the Video Block in a container (Row or Column block), and set a width for the container. That should resize the video proportionally.
Custom CSS should work if using an appropriate selector.
Your CSS is working: your custom class table-video is setting the figure element to 50% of the parent div, and that’s working excellently. If you want it smaller, reduce the width further but be mindful of mobile display (you probably want to use max-width instead). Alternatively, you could target the video element itself, not the parent figure element.
Good luck!
Thank you, George! I implemented a columns block for the solution.