OKLCH Studio · color reference

slate-400 in OKLCH

Tailwind v4 slate-400: oklch(0.704 0.040 256.8), HEX #90A1B9. WCAG + APCA pairs, Fix deep links, and @theme snippet.

slate-400 sits in the mid-light range — useful for secondary surfaces and large display type after a contrast check.

#90A1B9 · oklch(0.704 0.040 256.8)

Contrast pairs

WCAG 2.1 normal text + APCA Lc. Open a pair in the live Fix tool — informational only, not a legal audit.

Text on white2.63:1 · Fail · Lc 51
#90A1B9 on #FFFFFF
Open in Contrast →
White on swatchnot a suggestion2.63:1 · Fail · Lc 56
#FFFFFF on #90A1B9
Demo of a common fail — not a suggestion.
Open in Contrast →
Black on swatch7.98:1 · AAA · Lc 53
#000000 on #90A1B9
Open in Contrast →
Fix → AA on white4.98:1 · AA · Lc 74
#617187 on #FFFFFF
Open in Contrast →
Suggested text on swatch7.39:1 · AAA · Lc 52
#0D0D0D on #90A1B9
Open in Contrast →

Against #121212: This stop already passes AA as text on #121212 (7.12:1).

@theme {
  --color-slate-400: oklch(0.704 0.040 256.8);
}

Static reference — the live Fix tool uses the same WCAG math with Undo and share links.