Translucent frosted-glass panels floating over a vivid gradient background: background blur, 1px light borders, and soft depth. Popularized by macOS Big Sur and Windows Fluent's acrylic material.
Primary actionPanels of rgba-white over a colorful backdrop with backdrop-filter: blur(16px) saturate(160%) and a 1px rgba(255,255,255,0.2) border catching the light on top edges.