You have added the different section containers within the first section container - this means that these additional containers will all be constrained by the max-width set in the parent container. If you pull these containers out of the container so that they are in their own space then things should look a lot better.
Also - noticed you have set your accent alt colour to transparent. The alt colour is used for things like button text colour so if you use a button that is set to be styled with the Accent colour then at the minute you would not see the text added. I notice you have used custom styling on your buttons - which shouldn’t generally be required if you have your base colours set up right.
Hope this helps.
Any other issues just give me a shout.