1- You can use Inspect element and change each section for yourself. Then put the CSS codes in M.E. Calendar > Settings > Custom CSS.
If you want to make changes to design then you can use Inspect Tool to see the source code of your website and the CSS rules applied to it. To enable it right click and from the pop-up menu select Inspect Element.
For more details please visit Chrome inspect element or Firefox inspect element. Meanwhile searching in google about it will be helpful.
For example, we try to change the bottom gray border color in the footer. You can watch the tutorial video here:
and you will note that there are two sizes: 252X284, 190X234
I believe this is not a bug issue, and sorry for my poor english, I do not know how to express exactly here, but if you mind, I think it would be better that you could do some adjustment.
Thanks for your detailed information, and have a nice day.