#6E9CE3

CSS

:root {
  --blue-bay: #6e9ce3;
  --blue-bay-rgb: 110 156 227;
  --blue-bay-oklch: oklch(0.69 0.117 258.8);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(216 68% 66%);
  border-color: oklch(0.69 0.117 258.8);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6e9ce3;
  --color-blue-bay-50: #e3f6ff;
  --color-blue-bay-100: #d2e9ff;
  --color-blue-bay-200: #b8d6ff;
  --color-blue-bay-300: #95b8f4;
  --color-blue-bay-400: #749fe3;
  --color-blue-bay-500: #5486d3;
  --color-blue-bay-600: #4872b2;
  --color-blue-bay-700: #395b8f;
  --color-blue-bay-800: #27436a;
  --color-blue-bay-900: #1a2e4b;
  --color-blue-bay-950: #0a1b31;
}

SCSS

$blue-bay: #6e9ce3;
$blue-bay-rgb: 110, 156, 227;
$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);
}