#9DC8FA

CSS

:root {
  --sail-to-the-sea: #9dc8fa;
  --sail-to-the-sea-rgb: 157 200 250;
  --sail-to-the-sea-oklch: oklch(0.82 0.084 252.6);
}

.element {
  color: var(--sail-to-the-sea);
  background-color: hsl(212 90% 80%);
  border-color: oklch(0.82 0.084 252.6);
}

Tailwind CSS v4

@theme {
  --color-sail-to-the-sea: #9dc8fa;
  --color-sail-to-the-sea-50: #e5f7ff;
  --color-sail-to-the-sea-100: #d5eaff;
  --color-sail-to-the-sea-200: #bcd7f8;
  --color-sail-to-the-sea-300: #9abae2;
  --color-sail-to-the-sea-400: #7aa2cf;
  --color-sail-to-the-sea-500: #5c89bd;
  --color-sail-to-the-sea-600: #4f749f;
  --color-sail-to-the-sea-700: #3f5d80;
  --color-sail-to-the-sea-800: #2b445f;
  --color-sail-to-the-sea-900: #1d2f42;
  --color-sail-to-the-sea-950: #0d1c2b;
}

SCSS

$sail-to-the-sea: #9dc8fa;
$sail-to-the-sea-rgb: 157, 200, 250;
$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);
}