What color is Letterhead, Stationary for Pfau Architecture, San Francisco ?

Source Crayola® CSS3 CSS4
#499089
 
#319177
illuminating emerald
#5f9ea0
cadet blue
#5f9ea0
cadetblue
#889c99
 
#95918c
gray
#778899
light slate grey
#778899
lightslategrey