CSS problem with bootstrap

Secondly the style of the page ‘Excel Export +’ isn’t correct.
The page has a white background but not if you scroll down.
The white background is comming from bootstrap.

If the admin menu is not as long as the browser window, the bottom turns to white instead of being black.

It’s not a good practice to make changes in a framework but I simply removed the troublemakers from bootstrap’s CSS.
I guess the bootstrap doesn’t necessarily has to get updated ever.

I’ve removed this two pieces:

body{margin:0;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;line-height:20px;color:#333;background-color:#fff}
a{color:#08c;text-decoration:none}
a:hover,a:focus{color:#005580;text-decoration:underline}

and

ul,ol{padding:0;margin:0 0 10px 25px}