Not able to see cluster circle in offline mode

[krishnaglodha]

• I'm reporting a bug, not asking for help
• I'm sure this is a Leaflet.MarkerCluster code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
• I've searched through the issues to make sure it's not yet reported

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How to reproduce

• Leaflet version I'm using: 1.3
• Leaflet.MarkerCluster version I'm using: latest
• Browser (with version) I'm using: chrome
• OS/Platform (with version) I'm using: MacOS

What behaviour I'm expecting and which behaviour I'm seeing

I'm trying to create an offline cluster map, I'm able to get icons working ( by downloading icons and fixing leaflet.css ) but the cluster circle is not visible. It shows cluster population and a shape of extent, but not the circle