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CSS Glassmorphism Studio

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Design modern, frosted glass UI cards with live backdrop blur controls and copyable pure CSS code.

Glass Effect Controls

Backdrop Blur16px
Background Opacity25%
Border Opacity30%
Border Radius24px
Shadow Spread32px
#ffffff

Glassmorphism Card

Modern frosted glass component for sleek web user interfaces.

background: rgba(255, 255, 255, 0.25);
backdrop-filter: blur(16px);
-webkit-backdrop-filter: blur(16px);
border-radius: 24px;
border: 1px solid rgba(255, 255, 255, 0.3);
box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);

What is the CSS Glassmorphism Studio?

The Glassmorphism Studio builds frosted-glass panel effects visually and gives you the CSS. You adjust blur, transparency, border, and shadow, and see the result against a background as you work.

Glassmorphism is a style in which a panel appears to be frosted glass sitting above the content behind it. The effect comes primarily from backdrop-filter with a blur, combined with a semi-transparent background colour and a subtle light border.

What makes it convincing is the combination rather than the blur alone. The translucent background tints what shows through, the border catches an implied light source along the panel's edge, and a soft shadow lifts it off the surface beneath.

The effect depends entirely on there being something interesting behind the panel. Over a flat single colour, a blurred backdrop looks like a slightly tinted rectangle, because blurring a uniform colour produces the same uniform colour.

How to use the CSS Glassmorphism Studio

  1. Set the blur amount. Between 8 and 16 pixels is typical. Too little looks like plain transparency; too much loses the sense of what is behind.
  2. Adjust background transparency. An alpha between roughly 0.1 and 0.25 gives a convincing frosted appearance.
  3. Add a border and shadow. A one-pixel semi-transparent white border and a soft shadow are what make the panel read as a physical surface.
  4. Copy the generated CSS. Paste it into your stylesheet, including the -webkit- prefixed backdrop-filter for Safari.

Worked examples

A complete glass panel

Each declaration contributes: blur frosts the backdrop, the translucent background tints it, the border implies an edge, and the shadow lifts the panel.

Input
Blur:       12px
Background: rgba(255,255,255,0.15)
Border:     1px rgba(255,255,255,0.25)
Output
.glass {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

The -webkit- prefix is still required for Safari.

Keeping text readable

This is the most common failure of the style. Text over a blurred photograph can fall well below accessible contrast.

Input
Problem: white text over a light, busy backdrop

Fixes:
  - increase background alpha to 0.25-0.35
  - add a subtle text-shadow
  - darken the backdrop behind the panel
Output
Always verify contrast against the actual
background, not against a mockup. WCAG AA
requires 4.5:1 for body text, glass panels
frequently fail this without adjustment.

Common use cases

  • Navigation bars. A translucent header over scrolling content is one of the most effective uses of the style.
  • Modal dialogs and overlays. A glass panel above a blurred page keeps context visible while focusing attention.
  • Cards over imagery. Content panels above a photographic hero background.
  • Sidebars and floating panels. Persistent surfaces that hint at the content behind them.

Features and limitations

  • Live preview against a background so you can judge the real effect.
  • Controls for blur, background alpha, border, radius, and shadow.
  • Generates standard CSS including the -webkit- prefix for Safari.
  • backdrop-filter is supported in all current browsers; a solid background colour is a sensible fallback for older ones.
  • Backdrop blur is GPU-intensive. Many simultaneous glass panels, or one animating, can noticeably affect scrolling performance on lower-powered devices.

Frequently asked questions

Why does my glass effect look flat?

Almost always because there is nothing varied behind it. Blurring a flat colour produces the same flat colour. The effect needs a photograph, gradient, or other content behind the panel to blur.

Do I need the -webkit- prefix?

Yes, for Safari, which still requires -webkit-backdrop-filter. Include both declarations, with the prefixed version first.

What if backdrop-filter is not supported?

Provide a more opaque solid background as a fallback. Wrapping the enhancement in @supports (backdrop-filter: blur(1px)) keeps unsupported browsers on a readable solid panel.

Does it hurt performance?

It can. Backdrop blur is GPU-intensive, and the cost scales with the blurred area. Several large glass surfaces, or one animating during scroll, can cause noticeable jank on lower-powered devices. Use it deliberately rather than everywhere.

How do I keep text accessible on glass?

Check the actual contrast ratio against the real background rather than trusting appearance. Increasing the background alpha, adding a slight text shadow, or darkening the backdrop behind the panel all help. WCAG AA needs 4.5:1 for body text.

Why is my blur not applying?

Most often the element has no transparency, so there is no backdrop to see through, backdrop-filter requires a semi-transparent background. A fully opaque background hides the effect entirely.

All processing happens locally in your browser, your data never leaves your device.