.folded-corner{position:relative;overflow:hidden}.folded-corner::after{content:"";position:absolute;top:0;right:0;width:0;height:0;border-width:0 40px 40px 0;border-style:solid;border-color:#ffffff #ffffff #dedede #dedede;box-shadow:-2px 2px 4px rgba(0,0,0,0.15)}