#6F9DDD

CSS

:root {
  --blue-bay: #6f9ddd;
  --blue-bay-rgb: 111 157 221;
  --blue-bay-oklch: oklch(0.689 0.107 256.8);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(215 62% 65%);
  border-color: oklch(0.689 0.107 256.8);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6f9ddd;
  --color-blue-bay-50: #e3f7ff;
  --color-blue-bay-100: #d3eaff;
  --color-blue-bay-200: #b9d6ff;
  --color-blue-bay-300: #96b9ef;
  --color-blue-bay-400: #75a0dd;
  --color-blue-bay-500: #5687cc;
  --color-blue-bay-600: #4973ac;
  --color-blue-bay-700: #3a5c8a;
  --color-blue-bay-800: #274367;
  --color-blue-bay-900: #1a2f48;
  --color-blue-bay-950: #0b1b2f;
}

SCSS

$blue-bay: #6f9ddd;
$blue-bay-rgb: 111, 157, 221;
$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);
}