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Great job completing this challenge, one tip I have is I would try to avoid using custom css and tailwind together as in larger projects this can get really messy and confusing.

If you do choose to stick with custom css you can use css variables to handle the colors preventing you from having to rewrite the colors.

:root {
  --theme-dark-blue: hsl(234, 29%, 20%);
}

.heading {
  color: var(--theme-dark-blue);
}