Thanks for the idea. I made a scrollbar with Finsweet+. But it also doesn’t show up on iOS devices. 
Did I do something wrong?
<style>
/*width*/
::-webkit-scrollbar {
width:auto;
}
/*track*/
::-webkit-scrollbar-track {
background:rgba(49, 49, 49, 0.2);
}
/*thumb*/
::-webkit-scrollbar-thumb {
background:rgba(49, 49, 49, 0.6);
border-color:rgb(255, 0, 0);
}
</style>
