Make a button back to top with the effect of: full

Make a button back to top with the effect of: full - (iklangoogle = window.iklangoogle || []). Push ({}); (iklangoogle = window.iklangoogle || []). Push ({}); prettyPrint (); Button back to top or button back up , is a facility that we can post on a web page or blog in the form of a button that serves to return to the top