What is the hex code for Medium Blue?

Medium Blue is #0000cd. In CSS the keyword mediumblue, the hex #0000cd, rgb(0, 0, 205) and hsl(240, 100%, 40%) all paint the same color.

What is the opposite of Medium Blue on the color wheel?

The opposite (complementary) color is #cdcd00, 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 Blue for text?

Medium Blue as text on white has a contrast ratio of 11.16:1, which passes WCAG AA for body text (4.5:1). On black it is 1.88:1, which fails for body text. It works as a text color on light surfaces.

CSS color names · Blues

Medium Blue color: hex #0000cd, RGB and HSL

Medium Blue is the CSS keyword mediumblue, hex #0000cd, rgb(0, 0, 205), hsl(240, 100%, 40%). It is a dark, fully saturated blue in the blues 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: mediumblue
Hex: #0000cd
RGB: rgb(0, 0, 205)
HSL: hsl(240, 100%, 40%)
On white: 11.16:1 — passes AA for body text
On black: 1.88:1 — fails AA; use as a fill, not text

.example {
  color: mediumblue;          /* keyword */
  color: #0000cd;          /* hex */
  color: rgb(0, 0, 205); /* rgb */
  color: hsl(240, 100%, 40%); /* hsl */
}

What colors go with medium blue

Each match keeps medium blue'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 blue 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.

#cdcd00

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.

#cd6700

#67cd00

Triadic

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

#cd0000

#00cd00

Analogous

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

#0067cd

#6700cd

Tints and shades of medium blue

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

Tints (lighter)

#0101ff

#3434ff

#6666ff

#9999ff

#ccccff

Shades (darker)

#0000ab

#000089

#000067

#000044

#000022

A UI color palette built from medium blue

The eight semantic roles an interface actually uses, derived from medium blue 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: #0000cd
secondary: #cd6700
accent: #67cd00
background: #fcfcfd
surface: #f3f3f7
text: #111122
muted: #56568f
border: #dfdfec

Dark mode

primary: #1a1aff
secondary: #ff8c1a
accent: #8cff1a
background: #0e0e1b
surface: #151528
text: #f3f3f6
muted: #9494b8
border: #272749

Open medium blue in the palette generator

Using medium blue in an interface

Blue is the default interface color for a reason: it sits comfortably behind content, it has a wide usable lightness range for hover and pressed states, and its complement (orange) leaves red and green free for status. Most of the good primaries in this set are here. Whichever role medium blue 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 Blue?: Medium Blue is #0000cd. In CSS the keyword mediumblue, the hex #0000cd, rgb(0, 0, 205) and hsl(240, 100%, 40%) all paint the same color.
What colors go with Medium Blue?: Its complement is #cdcd00, the split-complementary pair is #cd6700 and #67cd00, the triadic partners are #cd0000 and #00cd00, and the analogous neighbors are #0067cd and #6700cd. In an interface, use Medium Blue for most colored elements and one of these for a single accent, at roughly an 80/20 split.
What is the opposite of Medium Blue on the color wheel?: The opposite (complementary) color is #cdcd00, 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 Blue for text?: Medium Blue as text on white has a contrast ratio of 11.16:1, which passes WCAG AA for body text (4.5:1). On black it is 1.88:1, which fails for body text. It works as a text color on light surfaces.