Float

The element floats up then bobs or hangs up and down continuously while hovered.

Add a "Bob" hover effect (also called hang) to [where].
The element should float up a little, then keep bobbing gently up and down while the pointer stays over it, and drop back when the pointer leaves: slow and soft.
Loop the bobbing only while hovered, and keep it still for users who prefer reduced motion.

A soft shadow appears or deepens beneath the element on hover to suggest elevation.

Add a "Hover Shadow" effect (also called drop shadow on hover or elevation on hover) to [where].
A soft shadow beneath the element should deepen and spread while the pointer is over it so it looks raised, and fade back when it leaves, while the element itself stays in place.
Keep the shadow subtle enough to work in both light and dark themes, and show the same effect on keyboard focus.

The element moves downward a few pixels on hover, as if pressed into the page.

Add a "Sink" hover effect to [where].
The element should move down a little and stay there while the pointer is over it, as if pressed into the page, and rise back when it leaves: smooth, with no bounce.
Move it visually without shifting the surrounding layout, and show the same effect on keyboard focus.

An arrow or the element itself slides a few pixels forward or backward on hover.

Add a "Nudge Forward / Backward" hover effect (also called arrow nudge) to [where].
The arrow should slide a little in the direction it points while the pointer is over the element, and slide back when it leaves: quick and small.
Move only the arrow without shifting the label or layout, and show the same effect on keyboard focus.

Sibling cards blur and dim while one hovered card stays sharp.

Add a "Focus Cards" effect (also called blur siblings on hover, hover focus blur or card hover effect) to [where].
While the pointer is over one card, the other cards should blur, dim and shrink slightly as the hovered card stays sharp, all with a smooth fade that reverses when the pointer leaves.
Apply the same focus on keyboard focus, and keep every card sharp and readable when nothing is hovered.

A colored light halo appears around the element on hover.

Add a "Glow" hover effect (also called neon glow) to [where].
A soft colored halo should fade in around the element while the pointer is over it and fade out when it leaves: gentle, with no movement.
Keep the halo from affecting layout, and show the same effect on keyboard focus.

The element smoothly scales up slightly when the pointer is over it.

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