#619DE7

CSS

:root {
  --blue-bay: #619de7;
  --blue-bay-rgb: 97 157 231;
  --blue-bay-oklch: oklch(0.687 0.127 254.5);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(213 74% 64%);
  border-color: oklch(0.687 0.127 254.5);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #619de7;
  --color-blue-bay-50: #def7ff;
  --color-blue-bay-100: #cdeaff;
  --color-blue-bay-200: #b2d7ff;
  --color-blue-bay-300: #8dbaf8;
  --color-blue-bay-400: #68a1e8;
  --color-blue-bay-500: #4588d8;
  --color-blue-bay-600: #3c73b6;
  --color-blue-bay-700: #2f5c92;
  --color-blue-bay-800: #1e446d;
  --color-blue-bay-900: #142f4c;
  --color-blue-bay-950: #061b33;
}

SCSS

$blue-bay: #619de7;
$blue-bay-rgb: 97, 157, 231;
$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);
}