Scanline overlay
Horizontal lines overlaid on content — evoking CRT monitors or retro aesthetics.
What you're seeing
Fine horizontal stripes across the background or image — adding texture and retro character.
Where you'll see it
Intentionally retro, tech, or film aesthetics.
Difficulty
Very low — 1/5
Libraries that build it
CSS only
Ready to prompt — paste this into your AI coding tool
"Apply repeating-linear-gradient of transparent/rgba lines every 3px as a fixed overlay, opacity 0.04"