It is a gray color that also contains blue tones. If you want to use it in your design, you can see the cool gray color's HEX and RGB codel on the right.
#F6F6F5
#E7E7E6
#D1D1D0
#B1B1AF
#848482
#6E6E6C
#5D5E5C
#4F504E
#454547
#3D3D3C
#262626
Related: Gray Gradients