1- Your issue is resolved now with the CSS code that I provides to you check the image for the code and for the results: https://postimg.cc/hXnprqgv now please check back to your site after clearing the browser cache.
2- For the logo, the thing is as you can see https://postimg.cc/V5YtDL03 the logo widget is not in the center because of two other widgets in the same row to make the logo center you should have to set the logo widget in the center of the row so that you will get the desired result. Regarding to the size of the logo you can use the “200 x 200” it will look like this: https://postimg.cc/rDYgLRx0
Regards 8Themes Team.
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