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css-border-gradient

Apply subtle gradient borders to cards, pricing panels, buttons, and other web surfaces. Choose layered CSS backgrounds or a masked border to suit existing designs, with guidance on Tailwind syntax, corner alignment, opacity, and light and dark themes.

OriginalShow the original description

Apply subtle gradient-border treatments for premium web surfaces. Use when cards, pricing panels, nav bars, modals, buttons, or hero surfaces need a refined edge highlight without a loud glow.

See how to install

Good for

  • Adding subtle borders to cards and pricing panels
  • Decorating edges without replacing a complex background
  • Adding brand accents to hover and focus states
  • Writing a one-off gradient border in Tailwind

Files included (12)

  • SKILL.md2.9 KB
  • demo/assets/page-01-65695f80-23f9-46ee-8487-cbb6c93cc48b-3840w.webp523.8 KB
  • demo/assets/page-02-724142aa-44a6-48d3-9cf3-761e00d05b78-1600w.jpg966.2 KB
  • demo/assets/page-03-4734259a-bad7-422f-981e-ce01e79184f2-1600w.jpg43.7 KB
  • demo/assets/page-04-005600e5-f6ab-4e59-bc86-eaeb02797dfa-1600w.jpg711.5 KB
  • demo/assets/page-05-e534354d-c5f2-4399-a1d9-2f50338e8c47-1600w.jpg83.3 KB
  • demo/assets/page-06-fb6415fd-bf4d-4ccf-8e9d-7ab445e99207-1600w.jpg197.2 KB
  • demo/assets/source-preview.jpg136.3 KB
  • demo/index.html44.4 KB
  • demo/preview.jpg95.8 KB
  • demo/PROMPT.md2.5 KB
  • demo/source.json4.4 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Border Gradients

Use When

  • A surface needs a more premium edge than a flat border.
  • Dark glass, pricing, hero, modal, or feature-card UI feels too plain.
  • A hover or focus state needs a quiet brand accent.

Defaults

  • Width: 1px; use 2px only for large hero cards or active states.
  • Radius: inherit the parent radius.
  • Angle: 135deg or 160deg.
  • Stops: neutral highlight, one brand accent, neutral fade.
  • Opacity: keep most stops below 0.4; subtle beats shiny.

Simple CSS Pattern

Use this when the surface has a solid or translucent fill.

.gradient-border {
  --surface: rgba(10, 14, 24, 0.72);
  --border-a: rgba(255, 255, 255, 0.34);
  --border-b: rgba(125, 92, 255, 0.36);
  --border-c: rgba(255, 255, 255, 0.08);

  border: 1px solid transparent;
  border-radius: 20px;
  background:
    linear-gradient(var(--surface), var(--surface)) padding-box,
    linear-gradient(135deg, var(--border-a), var(--border-b), var(--border-c)) border-box;
}
<div class="gradient-border">
  ...
</div>

Masked Pattern

Use this when the surface already has a complex background that should not be overwritten.

.gradient-border-mask {
  position: relative;
  border-radius: 20px;
}

.gradient-border-mask::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.34),
    rgba(125, 92, 255, 0.36) 45%,
    rgba(255, 255, 255, 0.08)
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

Tailwind Shortcut

Use arbitrary properties for one-off surfaces.

<div class="rounded-2xl border border-transparent [background:linear-gradient(rgba(10,14,24,.72),rgba(10,14,24,.72))_padding-box,linear-gradient(135deg,rgba(255,255,255,.34),rgba(125,92,255,.36),rgba(255,255,255,.08))_border-box]">
  ...
</div>

Taste Rules

  • Apply to one hierarchy level at a time: primary card, active tab, selected plan, or hero panel.
  • Do not use rainbow borders, full-saturation neon, or animated gradients by default.
  • Keep the border quieter than the content. It should frame, not compete.
  • Pair with restrained depth: a soft shadow or inner highlight is enough.
  • Check light and dark themes separately; the same alpha rarely works for both.

Quick Checks

  • No double border from an existing border-color.
  • Radius matches the surface exactly.
  • The gradient is visible at normal zoom but barely noticeable when scanning.
  • Focus states remain accessible and do not rely only on the gradient.

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