#729DD8

CSS

:root {
  --blue-bay: #729dd8;
  --blue-bay-rgb: 114 157 216;
  --blue-bay-oklch: oklch(0.689 0.099 256.5);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(215 57% 65%);
  border-color: oklch(0.689 0.099 256.5);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #729dd8;
  --color-blue-bay-50: #e4f7ff;
  --color-blue-bay-100: #d4eaff;
  --color-blue-bay-200: #bbd6ff;
  --color-blue-bay-300: #98b9eb;
  --color-blue-bay-400: #78a1d9;
  --color-blue-bay-500: #5988c7;
  --color-blue-bay-600: #4c73a8;
  --color-blue-bay-700: #3c5c87;
  --color-blue-bay-800: #294464;
  --color-blue-bay-900: #1c2f46;
  --color-blue-bay-950: #0c1b2e;
}

SCSS

$blue-bay: #729dd8;
$blue-bay-rgb: 114, 157, 216;
$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);
}