Full Code Not Translating

I work for a company who runs a very complex site on WordPress with a lot of different html and css templates. I coded the graphics for three separate pages inside a main page in the website and when I tested them on different online html test beds they worked fine.

I want to translate these new codes into the pages so I have been adding the css part of them to the appropriate css template in Editor and then going into the actual page’s “text” section to paste the custom html.

Hardly anything is showing up correct other than the alignment.. WordPress is not recognizing the background colors or inline-blocking of any of my containers. I’m new to coding and WordPress alike, not sure what to do here.