Problem encountered when trying to apply background opacity to custom colors using Tailwind CSS and shadcn/ui

Question

Problem encountered when trying to apply background opacity to custom colors using Tailwind CSS and shadcn/ui

While using Tailwind CSS along with the shadcn/ui library for styling buttons, I have encountered an unexpected behavior. The issue arises when trying to add background opacity to a custom color defined in globals.css using HSL values such as:

--primary: 348, 76%, 64%;

The problem occurs when attempting to set the background opacity of a button using this custom color in shadcn/ui. For example:

<button class="hover:bg-primary/90">Button</button>

The goal is to create a button with a hover effect that adds 90% opacity to the background color defined as --primary. However, the opacity setting doesn't seem to have any effect, and the button maintains its original opacity.

Even though the custom color is correctly defined and available in the project's global styles, using Tailwind utility classes to apply opacity to it doesn't produce the desired outcome.

javascript css reactjs tailwind-css tailwind-ui

Answer 1

Answer №1

When your file is structured like this:

--background: 231 15% 18%;
  --foreground: 60 30% 96%;

  --muted: 232 14% 31%;
  --muted-foreground: 60 30% 96%;

  --popover: 231 15% 18%;
  --popover-foreground: 60 30% 96%;

  --border: 232 14% 31%;
  --input: 225 27% 51%;

  --card: 232 14% 31%;
  --card-foreground: 60 30% 96%;

  --primary: 265 89% 78%;
  --primary-foreground: 60 30% 96%;

  --secondary: 326 100% 74%;
  --secondary-foreground: 60 30% 96%;

  --accent: 225 27% 51%;
  --accent-foreground: 60 30% 96%;

  --destructive: 0 100% 67%;
  --destructive-foreground: 60 30% 96%;

  --ring: 225 27% 51%;
  --radius: 1rem;

Ensure that it no longer uses commas, such as:

--background: 231 15% 18%;
  --foreground: 60 30% 96%;

  --muted: 232 14% 31%;
  --muted-foreground: 60 30% 96%;

  --popover: 231 15% 18%;
  --popover-foreground: 60 30% 96%;

  --border: 232 14% 31%;
  --input: 225 27% 51%;

  --card: 232 14% 31%;
  --card-foreground: 60 30% 96%;

  --primary: 265 89% 78%;
  --primary-foreground: 60 30% 96%;

  --secondary: 326 100% 74%;
  --secondary-foreground: 60 30% 96%;

  --accent: 225 27% 51%;
  --accent-foreground: 60 30% 96%;

  --destructive: 0 100% 67%;
  --destructive-foreground: 60 30% 96%;

  --ring: 225 27% 51%;
  --radius: 1rem;

Answer 2

When your file is structured like this:

--background: 231 15% 18%;
  --foreground: 60 30% 96%;

  --muted: 232 14% 31%;
  --muted-foreground: 60 30% 96%;

  --popover: 231 15% 18%;
  --popover-foreground: 60 30% 96%;

  --border: 232 14% 31%;
  --input: 225 27% 51%;

  --card: 232 14% 31%;
  --card-foreground: 60 30% 96%;

  --primary: 265 89% 78%;
  --primary-foreground: 60 30% 96%;

  --secondary: 326 100% 74%;
  --secondary-foreground: 60 30% 96%;

  --accent: 225 27% 51%;
  --accent-foreground: 60 30% 96%;

  --destructive: 0 100% 67%;
  --destructive-foreground: 60 30% 96%;

  --ring: 225 27% 51%;
  --radius: 1rem;

Ensure that it no longer uses commas, such as:

--background: 231 15% 18%;
  --foreground: 60 30% 96%;

  --muted: 232 14% 31%;
  --muted-foreground: 60 30% 96%;

  --popover: 231 15% 18%;
  --popover-foreground: 60 30% 96%;

  --border: 232 14% 31%;
  --input: 225 27% 51%;

  --card: 232 14% 31%;
  --card-foreground: 60 30% 96%;

  --primary: 265 89% 78%;
  --primary-foreground: 60 30% 96%;

  --secondary: 326 100% 74%;
  --secondary-foreground: 60 30% 96%;

  --accent: 225 27% 51%;
  --accent-foreground: 60 30% 96%;

  --destructive: 0 100% 67%;
  --destructive-foreground: 60 30% 96%;

  --ring: 225 27% 51%;
  --radius: 1rem;

Answer 3

Answer №2

Here are some things to consider:

Make sure the color is defined correctly in the Tailwind configuration. If you are using comma-delimited components, this indicates you are using legacy HSL format, so the color value in the Tailwind configuration should be similar to:
```
module.exports = {
  // …
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary), <alpha-value>)',
      },
    },
  },
  // …
};
```
Check if the file where the code is located is included in the content file globs.
Ensure that the declaration for --primary applies to an ancestor element of the <button>.
Verify that there are no other CSS styles in the project that could be conflicting with the styling of the <button> element.

For a complete example, see below:

tailwind.config = {
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary), <alpha-value>)',
      },
    },
  },
};

:root {
  --primary: 348, 76%, 64%;
}

<script src="https://cdn.tailwindcss.com/3.3.5"></script>

<button class="hover:bg-primary/50">Button</button>
<button class="bg-primary">Button</button>

Answer 4

Here are some things to consider:

Make sure the color is defined correctly in the Tailwind configuration. If you are using comma-delimited components, this indicates you are using legacy HSL format, so the color value in the Tailwind configuration should be similar to:
```
module.exports = {
  // …
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary), <alpha-value>)',
      },
    },
  },
  // …
};
```
Check if the file where the code is located is included in the content file globs.
Ensure that the declaration for --primary applies to an ancestor element of the <button>.
Verify that there are no other CSS styles in the project that could be conflicting with the styling of the <button> element.

For a complete example, see below:

tailwind.config = {
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary), <alpha-value>)',
      },
    },
  },
};

:root {
  --primary: 348, 76%, 64%;
}

<script src="https://cdn.tailwindcss.com/3.3.5"></script>

<button class="hover:bg-primary/50">Button</button>
<button class="bg-primary">Button</button>

Answer 5

Answer №3

To properly update the code, you should include / <alpha-value> instead of , <alpha-value>. Take a look at the revised snippet below:

module.exports = {
  // …
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary) / <alpha-value>)',
      },
    },
  },
  // …
};

Answer 6

To properly update the code, you should include / <alpha-value> instead of , <alpha-value>. Take a look at the revised snippet below:

module.exports = {
  // …
  theme: {
    extend: {
      colors: {
        primary: 'hsl(var(--primary) / <alpha-value>)',
      },
    },
  },
  // …
};

Answer 7

Answer №4

Dealing with a similar issue, I found a quick solution:

If you're facing problems with your custom colors in your tailwind config, consider using hsla instead of hsl.

For example, change this:

primary: {
      DEFAULT: "hsl(var(--primary))",
      foreground: "hsl(var(--primary-foreground))",
    },

to:

primary: {
          DEFAULT: "hsla(var(--primary))",
          foreground: "hsla(var(--primary-foreground))",
        },

This adjustment factors in the alpha value for better color calculation.

Answer 8

Dealing with a similar issue, I found a quick solution:

If you're facing problems with your custom colors in your tailwind config, consider using hsla instead of hsl.

For example, change this:

primary: {
      DEFAULT: "hsl(var(--primary))",
      foreground: "hsl(var(--primary-foreground))",
    },

to:

primary: {
          DEFAULT: "hsla(var(--primary))",
          foreground: "hsla(var(--primary-foreground))",
        },

This adjustment factors in the alpha value for better color calculation.

Problem encountered when trying to apply background opacity to custom colors using Tailwind CSS and shadcn/ui

Answer №1

Answer №2

Answer №3

Answer №4

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