I'm fairly new to druapl. I'm using Druapl CMS, I've got a few questions.

1) How do I remove the black bar at the bottom, I've already remove all the footer blocks, but there is still a huge black bar at the bottom of the site.

2) On wide screens, the white background stops and there's a drupal logo wall visible 'behind' the white background on the right. How do I make the white background go all the way?

3) How do I change the background and font colors?

our internal team has been tasked with upgrading our very old, large drupal 7 website to drupal 10, we're a government-related institution, so we have strict security compliance and need guaranteed 24/7 support, we need an agency that specifically handles huge, complex enterprise projects and not just general web design. Someone in our team suggested this company’s drupal development services, but we are still open to discussion and we need some more agencies so we can compare.

does anyone here had a good experience at this level of large scale migration and long-term security maintenance with an agency?