Lamp Effect

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.

Soft beams of light sway across the background.

Add a "Light Rays" background (also called god rays or light shafts) to [where].
Several soft, semi-transparent beams should fan out from the top and sway gently back and forth, brightening and dimming a little: slow and atmospheric.
Keep the rays behind the content and faint enough not to hurt readability, and stop them for users who prefer reduced motion.

Several color points blend smoothly and drift, forming an organic, multi-hue backdrop.

Add a "Mesh Gradient" background (also called an animated mesh gradient) to [where].
Several soft color spots should blend into one another and drift slowly around the area, so the backdrop keeps shifting in an organic way: very slow and smooth.
Keep content on top readable over every blend, and stop the drift for users who prefer reduced motion.

Diagonal streaks with glowing tails fall across a card or section.

Add a "Meteors" effect (also called a meteor shower or shooting stars) to [where].
A handful of small streaks with fading tails should shoot diagonally across the area at random moments, each one quick and then gone.
Keep them few so it stays an accent, clip them to the area's edges, and stop them for users who prefer reduced motion.