Convert rgba to hex for < IE8
Convert rgba to hex for < IE8

hmrc/assets-frontend,tmikus/assets-frontend,tmikus/assets-frontend,tmikus/assets-frontend,alexanderjamesking/assets-frontend,xnejp03/assets-frontend,xnejp03/assets-frontend,hmrc/assets-frontend,xnejp03/assets-frontend,alexanderjamesking/assets-frontend,hmrc/assets-frontend,alexanderjamesking/assets-frontend