Inserting a Youtube video into an article (Issue)

Hi,

I am making this post regarding trying to add a Youtube video into an article that I am writing.

The issue that I am having is that when I click on “Add Media”, and then on “Insert from URL” and add a link to the Youtube video that I want to post in the article then the video will come out small, taking up just under half the size of the screen. However, if I click on it (to highlight it) then I can see a blue box outlining the whole width of the page, and the video only filling up less than half of it for some reason. I would like the video to take up the whole width of the screen, or the ability to center the video which I also don’t seem to be able to do due to the whole “box” outline takes up the whole width of the page.

Thank you for your help!