Update MainButton.js

Author: melvin1992

src/MainButton.js

@@ -22,7 +22,6 @@ const Wrapper = styled('a')(({ background, size }) => ({
 
 const IconWrapper = styled('div')(({ isOpen }) => ({
   display: 'flex',
-  position: 'unset',
   textDecoration: 'none',
   WebkitTransition: '-webkit-transform 300ms',
   transition: 'transform 300ms',