jQuery not executing on cusotm JS page

Hello,

I want to use this script;

<script>    
$(document).ready(function() {
   $('.lees-meer').click(function(){
        $('#more-content').slideToggle('hide');
    });  
});
</script>

on this page:
https://www.uby.nl/shop/vloerprints/

I added also tried adding this code in the Custom JS page.

function() {
   $('.lees-meer').click(function(){
        $('#more-content').slideToggle('hide');
    });