When installing the second Linux distribution, Kali Linux disappeared from the grub menu. How to fix?

Question

GRUB

I have Kali installed on the /dev/sda6 partition.

I installed Zorin OS as a second system (not counting Windows), and after installation, there is no kali linux in the grub-a list.

Answer 1

You can make your decision through CSS3 animation and JavaScript. It's very simple
jsfiddle.net/dRpWv/665

Answer 2

Since the display property cannot be animated, a little trick is needed here. It consists in the fact that you first show a transparent block, and then animate the opacity property. Conversely, if you need to smoothly hide a block, first animate the opacity, and after the animation has completed, do display: none.
Here is an example.