Answer 1

add this line in your function
qwerty.classList.toggle("animate")

and paste this code in your css.. and remove the one from the div css
.animate{
-webkit-animation-name: example; /* Safari 4.0 - 8.0 */
-webkit-animation-duration: 4s; /* Safari 4.0 - 8.0 */
animation-name: example;
animation-duration: 4s;
}