Code for making selection from rotating options

Hi,

Here is a link to a page which shows the item in use and what I’m also wishing to use.

https://bradgate-motors.co.uk/bradgate.php

When you visit the page top left please click the drop down arrow for select a make.
You will now see the options available to select from.
I am interested is the rotation code.

If you are viewing on pc then you might need to adjust your viewing to say mobile to see what I am now seeing in my phone.

If you can assist with this code it will be gratefully useful to me.