Frost designs a frosted-glass card in CSS — the blurred, translucent “glassmorphism” look — with sliders for blur, transparency, tint and border, previewed live over a colourful backdrop. Copy the CSS when it looks right. Nothing is uploaded.

Blur 12px Transparency 25% Saturation 180% Border light 30% Corner radius 18px

Tint Backdrop

The effect relies on backdrop-filter, which blurs whatever sits behind the element — so it only shows up over other content, and a few older browsers don't support it (the tool adds the -webkit- prefix for Safari). Everything runs on your device.