Noise / Grain Texture

Tiny stars twinkle or drift across a dark space-like backdrop.

Add a "Starfield" background (also called a stars background or twinkling stars) to [where].
Tiny stars of different sizes should twinkle softly at their own pace while the whole field drifts very slowly: quiet and calm.
Keep the number of stars modest so it stays light, and stop the twinkling and drift for users who prefer reduced motion.

Many small dots drift, connect or react to the pointer across the background.

Add a "Particles" background (also called floating particles or a particle field) to [where].
Small dots of different sizes should float and drift slowly in gentle, wandering paths, each at its own pace: calm and airy.
Keep the number of dots modest so it stays light on slower devices, pause it when it is off screen, and stop it for users who prefer reduced motion.

Blur strength ramps gradually toward an edge so content fades out softly.

Add a "Progressive Blur" edge (also called a gradient blur edge) to [where].
Content scrolling toward the edge should get gradually blurrier and softer, ramping smoothly instead of cutting off at a hard line.
Show the blur only at an edge that still has more content beyond it, and keep the blurred area from blocking clicks or scrolling.

A tilted perspective grid scrolls toward the viewer like a synthwave floor.

Add a "Retro Grid" background (also called a perspective grid or synthwave grid) to [where].
A grid floor tilted away in perspective should scroll steadily toward the viewer and fade out into the horizon: smooth and endless.
Make the loop seamless so the lines never jump, and stop the scrolling for users who prefer reduced motion.