What color is Sidewall (possibly USA) ?

Source Crayola® CSS3 CSS4
#647a6c
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#dccbc2
 
#cdc5c2
silver
#d3d3d3
light gray
#d3d3d3
lightgrey
#86999a
 
#95918c
gray
#778899
light slate grey
#778899
lightslategrey
#383a34
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#aba595
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey