#00B4EA

CSS

:root {
  --blue-bikini: #00b4ea;
  --blue-bikini-rgb: 0 180 234;
  --blue-bikini-oklch: oklch(0.72 0.141 228.6);
}

.element {
  color: var(--blue-bikini);
  background-color: hsl(194 100% 46%);
  border-color: oklch(0.72 0.141 228.6);
}

Tailwind CSS v4

@theme {
  --color-blue-bikini: #00b4ea;
  --color-blue-bikini-50: #cdfeff;
  --color-blue-bikini-100: #b8f1ff;
  --color-blue-bikini-200: #93e0ff;
  --color-blue-bikini-300: #62c4f2;
  --color-blue-bikini-400: #14ade0;
  --color-blue-bikini-500: #0095cf;
  --color-blue-bikini-600: #007eaf;
  --color-blue-bikini-700: #00658c;
  --color-blue-bikini-800: #004b68;
  --color-blue-bikini-900: #003449;
  --color-blue-bikini-950: #001f30;
}

SCSS

$blue-bikini: #00b4ea;
$blue-bikini-rgb: 0, 180, 234;
$blue-bikini-light: mix(#fff, $blue-bikini, 20%);
$blue-bikini-dark: mix(#000, $blue-bikini, 20%);

.element {
  color: $blue-bikini;
  box-shadow: 0 0 0 2px rgba($blue-bikini, 0.35);
}