A frosted or blurred glass navigation bar, showing background content softly blurred through a semi-transparent bar, is a popular modern UI style using the CSS `backdrop-filter` property, common in operating system interfaces and premium-feeling web apps.
Adjust the blur intensity and background opacity with live controls, see the effect rendered over a sample colorful background, then copy the CSS needed to apply the same frosted glass treatment to your own fixed or sticky navigation bar.
Because `backdrop-filter` blurs whatever is actually behind the element (not a static background image), the effect stays dynamic and accurate as a user scrolls content underneath a fixed frosted navbar, unlike a pre-blurred background image.
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Frequently asked questions
Is backdrop-filter supported in all browsers?
It's supported in all current major browsers, though very old browser versions may not render the blur effect and would need a solid background color fallback.
Why use backdrop-filter instead of just a semi-transparent background?
A plain semi-transparent background alone shows unblurred content behind it, which can look messy; backdrop-filter blurs that background content for the clean, frosted glass look specifically.