#5F9DE9

CSS

:root {
  --blue-bay: #5f9de9;
  --blue-bay-rgb: 95 157 233;
  --blue-bay-oklch: oklch(0.687 0.13 254.4);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(213 76% 64%);
  border-color: oklch(0.687 0.13 254.4);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #5f9de9;
  --color-blue-bay-50: #def7ff;
  --color-blue-bay-100: #cceaff;
  --color-blue-bay-200: #b0d7ff;
  --color-blue-bay-300: #8cbaf9;
  --color-blue-bay-400: #66a1ea;
  --color-blue-bay-500: #4388da;
  --color-blue-bay-600: #3a73b8;
  --color-blue-bay-700: #2e5c94;
  --color-blue-bay-800: #1d446e;
  --color-blue-bay-900: #132f4d;
  --color-blue-bay-950: #051b33;
}

SCSS

$blue-bay: #5f9de9;
$blue-bay-rgb: 95, 157, 233;
$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);
}