Sparkles

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.

Colorful paper pieces burst out and fall to celebrate a success.

Add a "Confetti" celebration (also called a confetti burst) to [where].
Small colorful paper pieces should burst quickly out of the button, then tumble and drift down as they fade away, in a short, lively shower.
Fire it once per success rather than looping, keep it from blocking clicks on the page, and skip it for users who prefer reduced motion.

A soft cone or pool of light sweeps into place and lights part of the background.

Add a "Spotlight" effect (also called a spotlight sweep or light cone) to [where].
When the page loads, a soft cone of light should sweep in from the corner at an angle and settle over the heading, brightening as it arrives: slow and smooth.
Play it only once, and for users who prefer reduced motion show the light already in place.

Particles spiral around a center like a whirlpool.

Add a "Vortex" background (also called swirling particles) to [where].
Small particles should spiral inward around a center point like a whirlpool, fading in at the edge and fading out as they reach the middle, in a smooth, continuous swirl.
Keep the particle count modest, pause it when off screen, and stop the swirl for users who prefer reduced motion.