What color is Sidewall (possibly USA) ?

Source Crayola® CSS3 CSS4
#a5b697
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#76905c
 
#8a795d
shadow
#808080
grey
#808080
grey
#597146
 
#4a646c
deep space sparkle
#556b2f
dark olive green
#556b2f
darkolivegreen