What color is Panel ?

Source Crayola® CSS3 CSS4
#534c3f
 
#414a4c
outer space
#556b2f
dark olive green
#556b2f
darkolivegreen
#342a21
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#8a877d
 
#95918c
gray
#808080
grey
#808080
grey