Keep Calm, Buy Posters

“Keep Calm and Carry On” the poster orders, its message somewhat at odds with its presentation: white text set in imperious capitals in a distinctively British typeface against a background of panic-button red. You might be familiar with the slogan from the signature poster or from its many incarnations on T-shirts, mugs, tea towels and other products. It also appears on the cover of a recently published book of motivational quotes. Online store Remo first…