Round Corners

One vector shape smoothly turns into another shape.

Add a "Shape Morph" (also called path morphing or SVG morph) to [where].
One shape should smoothly turn into another, for example a pentagon pinching into a star, with its points gliding into place at an even, unhurried pace.
Give both shapes the same number of matching points so the morph stays clean without flicker, and play it once per state change rather than looping.

A diagonal band of light sweeps across the element from one side to the other on hover.

Add a "Shine Sweep" hover effect (also called sheen, shiny button, shine on hover, glint, shimmer or shimmer button) to [where].
A soft diagonal band of light should sweep across the element from left to right, repeating with a short pause while the pointer stays over it.
Keep the band clipped inside the element, stop it when the pointer leaves, and don't run it for users who prefer reduced motion.

The element smoothly scales down slightly when hovered.

Add a "Shrink" hover effect (also called scale down) to [where].
The element should scale down slightly and smoothly while the pointer is over it, and grow back when the pointer leaves: quick and subtle.
Keep the surrounding layout from shifting, and show the same effect on keyboard focus.

The background opens or closes like shutters from the center or the edges on hover.

Add a "Shutter Fill" hover effect (also called shutter) to [where].
The new background color should open from a line down the center out to both sides like shutters, and close back to the center when the pointer leaves, while the label color switches to stay readable: smooth and quick.
Keep the fill clipped inside the element and the label above it, and show the same effect on keyboard focus.