Custom marker is not showing up on the map

Hello,

I've used this plugin to display a map on a website I'm creating but the custom location marker is not showing up on the map. It's a 68px * 100px PNG image and I've put the absolute path in the code but it's not showing up on the map.

Url of the page with the map: https://coraliememe-naturopathe.fr/contact

Why is that?

Thanks!