Added marginTop, limit usage.
Added marginTop, limit usage.

ztx1491/ScrollToFixed,AyogoHealth/ScrollToFixed,doclabsoft/ScrollToFixed,ipman3/ScrollToFixed,anemes/ScrollToFixed,tomcatt86/ScrollToFixed,bigspotteddog/ScrollToFixed,ashutosh2k12/ScrollToFixed,nishadmenezes/ScrollToFixed