Blue Echo

CSS

:root {
  --blue-echo: #8dbbc9;
  --blue-echo-rgb: 141 187 201;
  --blue-echo-oklch: oklch(0.764 0.053 218.5);
}

.element {
  color: var(--blue-echo);
  background-color: hsl(194 36% 67%);
  border-color: oklch(0.764 0.053 218.5);
}

Tailwind CSS v4

@theme {
  --color-blue-echo: #8dbbc9;
  --color-blue-echo-50: #e6f9ff;
  --color-blue-echo-100: #d6ecf4;
  --color-blue-echo-200: #bddae4;
  --color-blue-echo-300: #9abeca;
  --color-blue-echo-400: #7ca6b3;
  --color-blue-echo-500: #5d8f9e;
  --color-blue-echo-600: #4f7985;
  --color-blue-echo-700: #3f616b;
  --color-blue-echo-800: #2d474e;
  --color-blue-echo-900: #1e3136;
  --color-blue-echo-950: #0e1d21;
}

SCSS

$blue-echo: #8dbbc9;
$blue-echo-rgb: 141, 187, 201;
$blue-echo-light: mix(#fff, $blue-echo, 20%);
$blue-echo-dark: mix(#000, $blue-echo, 20%);

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