Monochromatic shades share one hue & saturation — a wheel can't show lightness, so they're stacked at one point. See the ladder below.
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The Manual
RGB & Hex, Decoded
It's not a guess. It's arithmetic wearing a costume.
01 — RGB
Every color is three numbers: how much Red, Green and Blue light to mix. Each one runs
0 to 255 — 256 steps, because a computer counts in 8‑bit bytes, and 2⁸ = 256.
02 — Hex
Hex writes those same three numbers in base 16 instead of base 10 — two digits per
channel, 00 to FF, because 16 × 16 = 256. FF isn't a limit. It's just "255," spelled
in a different counting system.
03 — Decode one
3399FF
3 × 16 + 3= 51
9 × 16 + 9= 153
15 × 16 + 15= 255
First digit = how many 16s. Second digit = what's left over. A–F just cover 10–15, so
one digit can hold a value past 9. #3399FF and
rgb(51, 153, 255) are the same color — two number systems, same
three ingredients.
