#D3E4F2

CSS

:root {
  --hint-of-blue: #d3e4f2;
  --hint-of-blue-rgb: 211 228 242;
  --hint-of-blue-oklch: oklch(0.91 0.026 242.8);
}

.element {
  color: var(--hint-of-blue);
  background-color: hsl(207 54% 89%);
  border-color: oklch(0.91 0.026 242.8);
}

Tailwind CSS v4

@theme {
  --color-hint-of-blue: #d3e4f2;
  --color-hint-of-blue-50: #eff6fc;
  --color-hint-of-blue-100: #e1e9f0;
  --color-hint-of-blue-200: #cbd6df;
  --color-hint-of-blue-300: #adb9c4;
  --color-hint-of-blue-400: #91a1ad;
  --color-hint-of-blue-500: #788997;
  --color-hint-of-blue-600: #65747f;
  --color-hint-of-blue-700: #515c66;
  --color-hint-of-blue-800: #3a444b;
  --color-hint-of-blue-900: #282f34;
  --color-hint-of-blue-950: #161b1f;
}

SCSS

$hint-of-blue: #d3e4f2;
$hint-of-blue-rgb: 211, 228, 242;
$hint-of-blue-light: mix(#fff, $hint-of-blue, 20%);
$hint-of-blue-dark: mix(#000, $hint-of-blue, 20%);

.element {
  color: $hint-of-blue;
  box-shadow: 0 0 0 2px rgba($hint-of-blue, 0.35);
}