#99C7FF

CSS

:root {
  --sail-to-the-sea: #99c7ff;
  --sail-to-the-sea-rgb: 153 199 255;
  --sail-to-the-sea-oklch: oklch(0.818 0.093 253.7);
}

.element {
  color: var(--sail-to-the-sea);
  background-color: hsl(213 100% 80%);
  border-color: oklch(0.818 0.093 253.7);
}

Tailwind CSS v4

@theme {
  --color-sail-to-the-sea: #99c7ff;
  --color-sail-to-the-sea-50: #e4f7ff;
  --color-sail-to-the-sea-100: #d4eaff;
  --color-sail-to-the-sea-200: #bad7fc;
  --color-sail-to-the-sea-300: #98bae7;
  --color-sail-to-the-sea-400: #77a2d5;
  --color-sail-to-the-sea-500: #5989c3;
  --color-sail-to-the-sea-600: #4c74a4;
  --color-sail-to-the-sea-700: #3c5d84;
  --color-sail-to-the-sea-800: #294462;
  --color-sail-to-the-sea-900: #1c2f45;
  --color-sail-to-the-sea-950: #0c1b2c;
}

SCSS

$sail-to-the-sea: #99c7ff;
$sail-to-the-sea-rgb: 153, 199, 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);
}