Big Space added around embedded YouTube Blocks

Hi there, I'm fairly new to wordpress editing and had been creating a basic site in the TwentyTwenty theme following tutorials before purchasing the rock star pro theme to give me access to better options. However, one issue that has occurred is huge whitespace areas around embedded YouTube videos. These are not apparent on my 'edit page' when I'm creating/editing the page but as soon as I preview my site they appear. I've looked around and can't seem to find or understand why this is happening so any help is definitely appreciated! Thanks!