#87AFD5

CSS

:root {
  --high-seas: #87afd5;
  --high-seas-rgb: 135 175 213;
  --high-seas-oklch: oklch(0.739 0.07 247.5);
}

.element {
  color: var(--high-seas);
  background-color: hsl(209 48% 68%);
  border-color: oklch(0.739 0.07 247.5);
}

Tailwind CSS v4

@theme {
  --color-high-seas: #87afd5;
  --color-high-seas-50: #e6f7ff;
  --color-high-seas-100: #d7eaff;
  --color-high-seas-200: #bed7f2;
  --color-high-seas-300: #9cbbdb;
  --color-high-seas-400: #7da3c6;
  --color-high-seas-500: #608bb3;
  --color-high-seas-600: #517597;
  --color-high-seas-700: #415e79;
  --color-high-seas-800: #2d4559;
  --color-high-seas-900: #1f303e;
  --color-high-seas-950: #0e1c28;
}

SCSS

$high-seas: #87afd5;
$high-seas-rgb: 135, 175, 213;
$high-seas-light: mix(#fff, $high-seas, 20%);
$high-seas-dark: mix(#000, $high-seas, 20%);

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