Back to Top Widget Tutorial

Essential Classy Tab from Dashboad -> Widgets then enable Back to Top Widget Tutorial Widget
Now Drag and Drop Back to Top Widget Tutorial widget
Position : Left/Right
Manage Offset
Manage Position Left/Right + Bottom
Styling Tab

From Style Tab Manage Icon

Here in this tab you can manage Size and Normal/Hover color.

From Style Tab Manage Button

Here in this tab you can manage padding and margin.

Additionaly you can style Background, Border and Box Shadow for Normal and Hover.