#90C1FF

CSS

:root {
  --sail-to-the-sea: #90c1ff;
  --sail-to-the-sea-rgb: 144 193 255;
  --sail-to-the-sea-oklch: oklch(0.8 0.103 254.7);
}

.element {
  color: var(--sail-to-the-sea);
  background-color: hsl(214 100% 78%);
  border-color: oklch(0.8 0.103 254.7);
}

Tailwind CSS v4

@theme {
  --color-sail-to-the-sea: #90c1ff;
  --color-sail-to-the-sea-50: #e3f7ff;
  --color-sail-to-the-sea-100: #d2eaff;
  --color-sail-to-the-sea-200: #b8d7ff;
  --color-sail-to-the-sea-300: #96baec;
  --color-sail-to-the-sea-400: #74a1da;
  --color-sail-to-the-sea-500: #5588c9;
  --color-sail-to-the-sea-600: #4873a9;
  --color-sail-to-the-sea-700: #395c88;
  --color-sail-to-the-sea-800: #274465;
  --color-sail-to-the-sea-900: #1a2f47;
  --color-sail-to-the-sea-950: #0a1b2e;
}

SCSS

$sail-to-the-sea: #90c1ff;
$sail-to-the-sea-rgb: 144, 193, 255;
$sail-to-the-sea-light: mix(#fff, $sail-to-the-sea, 20%);
$sail-to-the-sea-dark: mix(#000, $sail-to-the-sea, 20%);

.element {
  color: $sail-to-the-sea;
  box-shadow: 0 0 0 2px rgba($sail-to-the-sea, 0.35);
}