Clipboard landing page using Flexbox - mobile first design

Hello.

So I've tried another landing page. I wasn't sure how to make image of the computer go behind the screen. I came up with some solution using scale to do so, but I don't know if it's alright. Is there any other way to do it?

At first, I wanted to have one big container that would wrap all the content, but there was a problem to get that computer of it. So I decided to use containers separately in each section to have more control of their width. But I ended up with three types of containers instead of one, which I'm not sure if it's the cleanest solution. So is there a way how to it with only one type of container and get the image of the computer out of it somehow? Thanks in advance.