CSS color names · Greens

Medium Aquamarine color: hex #66cdaa, RGB and HSL

Medium Aquamarine is the CSS keyword mediumaquamarine, hex #66cdaa, rgb(102, 205, 170), hsl(160, 51%, 60%). It is a medium, muted cyan in the greens family. Below: the colors that go with it, its tints and shades, how it reads as text, and a complete interface palette built from it.

CSS name
mediumaquamarine
Hex
#66cdaa
RGB
rgb(102, 205, 170)
HSL
hsl(160, 51%, 60%)
On white
1.93:1 — fails AA; use as a fill, not text
On black
10.88:1 — passes AA for body text
.example {
  color: mediumaquamarine;          /* keyword */
  color: #66cdaa;          /* hex */
  color: rgb(102, 205, 170); /* rgb */
  color: hsl(160, 51%, 60%); /* hsl */
}

What colors go with medium aquamarine

Each match keeps medium aquamarine's saturation and lightness and rotates only the hue, so the relationship is the wheel's and nothing else. Any of these can be an accent beside medium aquamarine as the primary; the harmony guides explain which rule suits which interface.

Complementary

The opposite hue, 180° away — the strongest contrast, best kept to one accent per screen.

#cd6689

Split-complementary

The two neighbors of the complement, at 150° and 210° — most of the contrast with less tension, and two accents instead of one.

#cd66bc
#cd7766

Triadic

Two hues at 120° and 240° — three evenly spaced signals, the scheme charts and category colors want.

#aa66cd
#cdaa66

Analogous

The neighbors at −30° and +30° — calm and cohesive, with emphasis coming from weight and size rather than hue.

#66cd77
#66bccd

Tints and shades of medium aquamarine

Tints add lightness toward white; shades remove it toward black. The hue and saturation stay fixed, so every step still reads as medium aquamarine — these are the hover, pressed, disabled and surface variants a single brand color needs.

Tints (lighter)

#80d5b8
#99dec6
#b2e6d5
#cceee3
#e6f7f1

Shades (darker)

#3fc095
#329a77
#267459
#194d3b
#0d271e

A UI color palette built from medium aquamarine

The eight semantic roles an interface actually uses, derived from medium aquamarine as the primary with the split-complementary rule: secondary and accent rotate around the wheel, and the five neutrals take the hue at lightness steps tuned for light and dark mode. This is the same derivation the palette generator runs — open it there to change the rule, drag the anchors, or export the set as CSS variables.

Light mode
primary
#66cdaa
secondary
#cd66bc
accent
#cd7766
background
#fcfdfd
surface
#f3f6f5
text
#12211c
muted
#5b8a7a
border
#e0ebe7
Dark mode
primary
#66cdaa
secondary
#cd66bc
accent
#cd7766
background
#0f1a16
surface
#172621
text
#f3f6f5
muted
#98b3aa
border
#2a463d

Using medium aquamarine in an interface

Green means success and 'on' — reserve one green for that job before you use another as a brand color. Sea green, forest green and teal are calm enough to lead a palette; the neon greens are for dark-mode accents and little else. Whichever role medium aquamarine takes, define it once as a token rather than repeating the keyword: the semantic palette guide covers the eight roles, and the guides to complementary, triadic and the other color schemes explain how to weight the matches above.

What is the hex code for Medium Aquamarine?
Medium Aquamarine is #66cdaa. In CSS the keyword mediumaquamarine, the hex #66cdaa, rgb(102, 205, 170) and hsl(160, 51%, 60%) all paint the same color.
What colors go with Medium Aquamarine?
Its complement is #cd6689, the split-complementary pair is #cd66bc and #cd7766, the triadic partners are #aa66cd and #cdaa66, and the analogous neighbors are #66cd77 and #66bccd. In an interface, use Medium Aquamarine for most colored elements and one of these for a single accent, at roughly an 80/20 split.
What is the opposite of Medium Aquamarine on the color wheel?
The opposite (complementary) color is #cd6689, the same saturation and lightness rotated 180° around the HSL wheel. Complementary pairs give the strongest contrast, which is why the complement should be used sparingly rather than at equal weight.
Can I use Medium Aquamarine for text?
Medium Aquamarine as text on white has a contrast ratio of 1.93:1, which fails WCAG AA for body text (4.5:1) and for large text (3:1). On black it is 10.88:1, which passes for body text. Use it as text on dark surfaces, or as a fill with dark text on top.

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