#999AA7

CSS

:root {
  --too-big-to-whale: #999aa7;
  --too-big-to-whale-rgb: 153 154 167;
  --too-big-to-whale-oklch: oklch(0.69 0.019 282.4);
}

.element {
  color: var(--too-big-to-whale);
  background-color: hsl(236 7% 63%);
  border-color: oklch(0.69 0.019 282.4);
}

Tailwind CSS v4

@theme {
  --color-too-big-to-whale: #999aa7;
  --color-too-big-to-whale-50: #f4f4fa;
  --color-too-big-to-whale-100: #e7e7ee;
  --color-too-big-to-whale-200: #d3d3dc;
  --color-too-big-to-whale-300: #b6b6c1;
  --color-too-big-to-whale-400: #9c9daa;
  --color-too-big-to-whale-500: #848593;
  --color-too-big-to-whale-600: #70707c;
  --color-too-big-to-whale-700: #595a63;
  --color-too-big-to-whale-800: #414249;
  --color-too-big-to-whale-900: #2d2d33;
  --color-too-big-to-whale-950: #1a1a1e;
}

SCSS

$too-big-to-whale: #999aa7;
$too-big-to-whale-rgb: 153, 154, 167;
$too-big-to-whale-light: mix(#fff, $too-big-to-whale, 20%);
$too-big-to-whale-dark: mix(#000, $too-big-to-whale, 20%);

.element {
  color: $too-big-to-whale;
  box-shadow: 0 0 0 2px rgba($too-big-to-whale, 0.35);
}