Content creation

I'm trying to create a "header" region in my course presentation content by creating a rectangle shape with a white background.

When I resize shape and attempt to make it stetch the whole width of the presentation canvas, I am still left with a gap on the right-side of the shape:

When I inspect the shape element, I can see that container has a max width of 99.7821%:

I am trying to find public content that has been created and available on the h5p site.  I can create content and I love it, I'm trying to show other teachers how they can find content that is already there.  We use canvas so we would most likely use the embed codes for it.

Thanks in advance

I've integrated H5P to my Brightspace Insert Stuff tool but when I create a new H5P item (I've tried the hotspot and the interactive video) it will let me create it but no NEXT button is available to move forward with adding the item to my content.  Image attached.