Well Blue

CSS

:root {
  --well-blue: #00888b;
  --well-blue-rgb: 0 136 139;
  --well-blue-oklch: oklch(0.569 0.097 197.5);
}

.element {
  color: var(--well-blue);
  background-color: hsl(181 100% 27%);
  border-color: oklch(0.569 0.097 197.5);
}

Tailwind CSS v4

@theme {
  --color-well-blue: #00888b;
  --color-well-blue-50: #d6feff;
  --color-well-blue-100: #c3f2f4;
  --color-well-blue-200: #a3e1e4;
  --color-well-blue-300: #79c7ca;
  --color-well-blue-400: #4db0b3;
  --color-well-blue-500: #00999d;
  --color-well-blue-600: #098284;
  --color-well-blue-700: #0a686a;
  --color-well-blue-800: #054d4d;
  --color-well-blue-900: #053535;
  --color-well-blue-950: #002021;
}

SCSS

$well-blue: #00888b;
$well-blue-rgb: 0, 136, 139;
$well-blue-light: mix(#fff, $well-blue, 20%);
$well-blue-dark: mix(#000, $well-blue, 20%);

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