Check your monitor's contrast and black level settings

There are black plus 14 levels of gray plus white.

Style="background: #RGB;"
where Hex codes from 0 (darkest) through F (brightest)
stand in for each of R=Red, G=Green, B=Blue

Each color on this page is represented by the 16 values listed below.

Not only Grayscale, but check each color intensity too!

Scroll down to see Red, then Green, thrn Blue.

#000
#111
#222
#333
#444
#555
#666
#777
#888
#999
#AAA
#BBB
#CCC
#DDD
#EEE
#FFF
#000
#100
#200
#300
#400
#500
#600
#700
#800
#900
#A00
#B00
#C00
#D00
#E00
#F00
#000
#010
#020
#030
#040
#050
#060
#070
#080
#090
#0A0
#0B0
#0C0
#0D0
#0E0
#0F0
#000
#001
#002
#003
#004
#005
#006
#007
#008
#009
#00A
#00B
#00C
#00D
#00E
#00F