#679EDB

CSS

:root {
  --blue-bay: #679edb;
  --blue-bay-rgb: 103 158 219;
  --blue-bay-oklch: oklch(0.686 0.108 252);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(212 62% 63%);
  border-color: oklch(0.686 0.108 252);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #679edb;
  --color-blue-bay-50: #e1f8ff;
  --color-blue-bay-100: #d0ebff;
  --color-blue-bay-200: #b5d7ff;
  --color-blue-bay-300: #91bbee;
  --color-blue-bay-400: #6ea2dc;
  --color-blue-bay-500: #4d89cb;
  --color-blue-bay-600: #4274ab;
  --color-blue-bay-700: #345d8a;
  --color-blue-bay-800: #234566;
  --color-blue-bay-900: #172f48;
  --color-blue-bay-950: #081c2f;
}

SCSS

$blue-bay: #679edb;
$blue-bay-rgb: 103, 158, 219;
$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);
}