Creating a Sleek Glassmorphic UI in Vanilla CSS

Glassmorphism has taken modern design by storm. To achieve it properly without bulky libraries, you only need three things:

1. A slightly transparent background (rgba(255, 255, 255, 0.1)).

2. The magical backdrop-filter: blur(10px) property.

3. A subtle 1px border with a slightly lighter transparency to mimic the edge of the glass.

Stack these on top of a vibrant gradient background and you have a premium looking component.