#1F6878

CSS

:root {
  --teal-with-it: #1f6878;
  --teal-with-it-rgb: 31 104 120;
  --teal-with-it-oklch: oklch(0.48 0.074 215.6);
}

.element {
  color: var(--teal-with-it);
  background-color: hsl(191 59% 30%);
  border-color: oklch(0.48 0.074 215.6);
}

Tailwind CSS v4

@theme {
  --color-teal-with-it: #1f6878;
  --color-teal-with-it-50: #dffbff;
  --color-teal-with-it-100: #ceeff8;
  --color-teal-with-it-200: #b2dde9;
  --color-teal-with-it-300: #8cc1d0;
  --color-teal-with-it-400: #69aaba;
  --color-teal-with-it-500: #4493a5;
  --color-teal-with-it-600: #3b7c8b;
  --color-teal-with-it-700: #2f6370;
  --color-teal-with-it-800: #204952;
  --color-teal-with-it-900: #153339;
  --color-teal-with-it-950: #061e23;
}

SCSS

$teal-with-it: #1f6878;
$teal-with-it-rgb: 31, 104, 120;
$teal-with-it-light: mix(#fff, $teal-with-it, 20%);
$teal-with-it-dark: mix(#000, $teal-with-it, 20%);

.element {
  color: $teal-with-it;
  box-shadow: 0 0 0 2px rgba($teal-with-it, 0.35);
}