Object .offset( )
Get the current coordinates of the first element in the set of matched elements, relative to the document.The .offset() method allows us to retrieve the current position of an element relative to the document. Contrast this with .position(), which retrieves the current position relative to the offset parent. When positioning a new element on top of an existing one for global manipulation (in particular, for implementing drag-and-drop), .offset() is the more useful.
.offset() returns an object containing the properties top and left.
Note: jQuery does not support getting the offset coordinates of hidden elements or accounting for borders, margins, or padding set on the body element.
Object.offset( Object coordinates )
Set the current coordinates of every element in the set of matched elements, relative to the document.The .offset() setter method allows us to reposition an element. The element's position is specified relative to the document. If the element's position style property is currently static, it will be set to relative to allow for this repositioning.
Final code and demo is here
Demo
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