This "Back to top" link allows users to smoothly scroll back to the top of the page. It's a little detail which enhances navigation experience on website with long pages.

Element (default: "body,html")
Element that is affected by smooth scroll to top. You can choose tags, classes or ID's to specify the element that you want to be scroll-able.
Imagine if you have just ".MainContent" scroll-able, you will use ".MainContent" class to apply to this element.

E.g: (Tags)  - "body,html"
E.g: (Classes) - ".className"
E.g: (ID's) - "#elementeId"

ElementOffset (default: 300)
Browser window scroll (in pixels) after which the "back to top" link is shown

ElementOpacity (default: 1200)
Browser window scroll (in pixels) after which the "back to top" link opacity is reduced

ElementScrollTopDuration (default: 700)
Duration of the top scrolling animation (in ms)

IconName (default: Entities.IconName.arrow_circle_o_up)
Back to top arrow icon

IconSizeId (default: Entities.IconSize.Percent_33)
Back to top icon size.

IconColor (default: White)
Back to top icon color.

Color (default: Orange)
Back to top background color. 

BorderRadius (default: 5px)
Back to top border-radius.

Bottom (default: 30px)
Distance form the bottom.

Right (default: 30px)
Distance form the right.