#6D9DDF

CSS

:root {
  --blue-bay: #6d9ddf;
  --blue-bay-rgb: 109 157 223;
  --blue-bay-oklch: oklch(0.689 0.111 256.6);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(215 64% 65%);
  border-color: oklch(0.689 0.111 256.6);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6d9ddf;
  --color-blue-bay-50: #e2f7ff;
  --color-blue-bay-100: #d2eaff;
  --color-blue-bay-200: #b8d6ff;
  --color-blue-bay-300: #95b9f0;
  --color-blue-bay-400: #73a0df;
  --color-blue-bay-500: #5387ce;
  --color-blue-bay-600: #4773ae;
  --color-blue-bay-700: #385c8c;
  --color-blue-bay-800: #264368;
  --color-blue-bay-900: #192f49;
  --color-blue-bay-950: #0a1b30;
}

SCSS

$blue-bay: #6d9ddf;
$blue-bay-rgb: 109, 157, 223;
$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);
}