#7CADE4

CSS

:root {
  --high-seas: #7cade4;
  --high-seas-rgb: 124 173 228;
  --high-seas-oklch: oklch(0.734 0.096 252);
}

.element {
  color: var(--high-seas);
  background-color: hsl(212 66% 69%);
  border-color: oklch(0.734 0.096 252);
}

Tailwind CSS v4

@theme {
  --color-high-seas: #7cade4;
  --color-high-seas-50: #e3f7ff;
  --color-high-seas-100: #d2eaff;
  --color-high-seas-200: #b9d7fd;
  --color-high-seas-300: #96bbe8;
  --color-high-seas-400: #74a2d6;
  --color-high-seas-500: #558ac4;
  --color-high-seas-600: #4874a5;
  --color-high-seas-700: #395d85;
  --color-high-seas-800: #274562;
  --color-high-seas-900: #1a2f45;
  --color-high-seas-950: #0b1c2d;
}

SCSS

$high-seas: #7cade4;
$high-seas-rgb: 124, 173, 228;
$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);
}