Vortex

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.

Small circles or icons revolve around a centre on circular paths.

Add "Orbiting Circles" (also called an orbit animation or orbiting icons) to [where].
Small circles should revolve slowly and steadily around a central element on circular rings, with the outer ring turning the other way and more slowly.
Keep the loop seamless and the orbiting items upright, and stop the rotation for users who prefer reduced motion.

Layered wavy lines or shapes undulate horizontally.

Add a "Wave Background" (also called a wavy background or animated waves) to [where].
A few layered wave shapes should roll sideways at slightly different speeds so they overlap and shift like water: slow and smooth.
Make each wave loop seamlessly without a visible jump, and stop the waves for users who prefer reduced motion.

A glowing pulse travels along a line connecting two elements.

Add an "Animated Beam" effect (also called a connecting beam) to [where].
A short glowing pulse should travel along the line that connects two elements, moving steadily from one end to the other and then starting again: smooth and calm.
Keep the connecting line itself visible at all times, and hold the pulse still for users who prefer reduced motion.

Colors in a gradient background slowly shift, pan or rotate.

Add an "Animated Gradient" background (also called a gradient animation or moving gradient) to [where].
The colors of the gradient should slowly pan across the area in a soft, continuous drift, with no visible jump when the loop restarts.
Keep text on top readable against every color, and stop the movement for users who prefer reduced motion.