Flex Container

flex row=   .flexR
flex row start=   .flexRl
flex row center=   .flexRc
flex row end=   .flexRr
flex row center center=   .flexRcc

flex column=   .flexC
flex column start=   .flexCl
flex column center=   .flexCc
flex column end=   .flexCr
flex column center center=   .flexCcc