Bugs with Purple Press theme

Hello everyone,

I am helping for a website for someone: https://andrejpejicmodel.com/,(the previous theme pandora had a lot of bugs, so we change it), the problem is that I still get some bugs with the new theme, and I don’t know how to fix it with the css:
https://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fandrejpejicmodel.com%2F

1/the background image doesn’t show though I inserted the code:
#art-page-background-glare-image
{background: url(“https://andrejpejicmodel.com/wp-content/uploads/2012/04/bg-andrej-pejic-baby2.jpg”) repeat fixed center top transparent;}

2/Images doesn’t apprear in the top slider, and I don’t know why?

3/ I would like to change the grey color of the right sidebar and I can’t find the line.

4/ I want to remove the footer.

5/ What is the line for the color of the text?

Thanks a lot for any help!!!