skill

Animation / CSS Border Gradient

CSS градиентные рамки с псевдоэлементом. Настройка угла, цветов, толщины и радиуса. Идеально для UI-дизайна.

by Zhou Jason

Prompt

# Animation / CSS Border Gradient

# CSS Border Gradient Skill

## Workflow
1. Confirm environment (plain CSS vs Tailwind) and gather missing specs (border radius, thickness, angle, colors).
2. Provide the baseline snippet and a short usage checklist.
3. Offer focused tweaks only (change angle, colors, thickness, radius) and avoid redesigning the component.

## Baseline snippet
```css
.border-gradient {
  position: relative;
}

.border-gradient::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 10px;
  padding: 1px;
  -webkit-mask: linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  background: linear-gradient(225deg,
    rgba(255, 255, 255, 0.0) 0%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(255, 255, 255, 0.0) 100%);
  pointer-events: none;
}
```

## Usage checklist
- Insert the snippet in global CSS or the page `<head>`.
- Add `border-gradient` to the element.
- Remove any existing `border` styles.
- Match the element radius to the pseudo-element radius.

## Tailwind example
```html
<div class="border-gradient rounded-lg before:rounded-lg">
  ...
</div>
```

If a project uses Tailwind layers, wrap the class in `@layer utilities`.

## Customization knobs
- Thickness: change `padding` (for example `2px`).
- Radius: change `border-radius` or the `before:rounded-*` class.
- Angle: change the `linear-gradient(225deg, ...)` angle.
- Colors: adjust the `rgba(...)` stops to fit the theme.

## Common pitfalls
- Mismatched radius between the element and pseudo-element.
- Leaving an existing border on the element (double border).
- Tailwind purge removing the class because it is not referenced in content files.

## Questions to ask when specs are missing
- What border radius and thickness do you want?
- What gradient angle and colors should it use?
- Is this for light, dark, or both themes?

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