Need some reset button to default the settings, and

Need some settings for sites to left-center-right alt in body and html

it's has always driving me nuts, when Some html, body and borders are being displayed in left site after top-banner on responsive sites instead of being center when i zooming in.

so basicly what i ask for is a feature to keep borders and body to align="center" when i zoom, while making side-banners pushed out of display sight, this site is an good example.