Here is the code for a custom cursor:
<style>
* {
cursor: url(' '), auto;
}
</style>
The most popular cursor site is Cursors-4U. You need to find a cursor you like and underneath the image there should be a copy+paste link for it. Paste the link between the (' ') and it should work :)
If you cant find one you like, you can create your own and upload it to a cursor site and follow the same steps