#D5E5F5

CSS

:root {
  --hint-of-blue: #d5e5f5;
  --hint-of-blue-rgb: 213 229 245;
  --hint-of-blue-oklch: oklch(0.915 0.028 248.1);
}

.element {
  color: var(--hint-of-blue);
  background-color: hsl(210 62% 90%);
  border-color: oklch(0.915 0.028 248.1);
}

Tailwind CSS v4

@theme {
  --color-hint-of-blue: #d5e5f5;
  --color-hint-of-blue-50: #eff6fd;
  --color-hint-of-blue-100: #e1e9f1;
  --color-hint-of-blue-200: #ccd5e0;
  --color-hint-of-blue-300: #adb9c5;
  --color-hint-of-blue-400: #92a0ae;
  --color-hint-of-blue-500: #788898;
  --color-hint-of-blue-600: #667381;
  --color-hint-of-blue-700: #515c67;
  --color-hint-of-blue-800: #3b444c;
  --color-hint-of-blue-900: #282f35;
  --color-hint-of-blue-950: #161b20;
}

SCSS

$hint-of-blue: #d5e5f5;
$hint-of-blue-rgb: 213, 229, 245;
$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);
}