#6E9ED7

CSS

:root {
  --blue-bay: #6e9ed7;
  --blue-bay-rgb: 110 158 215;
  --blue-bay-oklch: oklch(0.688 0.099 253.4);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(213 57% 64%);
  border-color: oklch(0.688 0.099 253.4);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6e9ed7;
  --color-blue-bay-50: #e3f7ff;
  --color-blue-bay-100: #d2eaff;
  --color-blue-bay-200: #b9d7ff;
  --color-blue-bay-300: #96baea;
  --color-blue-bay-400: #74a2d8;
  --color-blue-bay-500: #5589c6;
  --color-blue-bay-600: #4874a7;
  --color-blue-bay-700: #395d86;
  --color-blue-bay-800: #274464;
  --color-blue-bay-900: #1a2f46;
  --color-blue-bay-950: #0a1c2d;
}

SCSS

$blue-bay: #6e9ed7;
$blue-bay-rgb: 110, 158, 215;
$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);
}