^^Hover, active, focus.

:hover  is a CSS pseudo-class.

It is generally triggered when the user hovers over an element with a pointing device.

p:hover {color: orange;}

/* Selects any <p> element when "hovered" */

Note: The :hover pseudo-class is problematic on touchscreens.

developer.mozilla/CSS/:hover

Esempi librosito

Css transition. Hover.

Studio

ho programmato:
yellow: background normale
red: hover
greeen: active
blue: focus

p paragraph

h1 header

h2 header 2

h3 header 3