: active effect

Answer 1

Visit :

https://www.w3schools.com/cssref/sel_active.asp

Answer 2

:active is a CSS pseudo-class. It specifies and selects an element based on a state—the active state—and is used to apply styles to an element when it matches that state.

Answer 3

Make your question clear
https://www.sololearn.com/discuss/333866/?ref=app