bottom property affects the vertical position of a positioned element.
This property has no effect on non-positioned elements.
bottomproperty sets the bottom edge of an element to a unit above/below the bottom edge of its nearest positioned ancestor.
bottomproperty makes the element's bottom edge to move above/below its normal position.
bottomproperty behaves like its position is relative when the element is inside the viewport, and like its position is fixed when it is outside.
bottomproperty has no effect.