#669DE2

CSS

:root {
  --blue-bay: #669de2;
  --blue-bay-rgb: 102 157 226;
  --blue-bay-oklch: oklch(0.687 0.118 254.7);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(213 68% 64%);
  border-color: oklch(0.687 0.118 254.7);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #669de2;
  --color-blue-bay-50: #e0f7ff;
  --color-blue-bay-100: #cfeaff;
  --color-blue-bay-200: #b4d7ff;
  --color-blue-bay-300: #90baf4;
  --color-blue-bay-400: #6da1e3;
  --color-blue-bay-500: #4c88d2;
  --color-blue-bay-600: #4173b2;
  --color-blue-bay-700: #335c8f;
  --color-blue-bay-800: #22446a;
  --color-blue-bay-900: #162f4b;
  --color-blue-bay-950: #071b31;
}

SCSS

$blue-bay: #669de2;
$blue-bay-rgb: 102, 157, 226;
$blue-bay-light: mix(#fff, $blue-bay, 20%);
$blue-bay-dark: mix(#000, $blue-bay, 20%);

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