Leaflet layer control style

Question

I have trouble with changing the image in layer control I tried this: https://jsfiddle.net/v95h1kx4/

My browser has no problem with this but some people have top of the control blue and bottom of the control white - without the actual image. The weird thing is that they even use the same browser (Firefox, Chrome). It shows no errors for them too.

Answer 1

Simply add background-size: 20px 20px; in .leaflet-control-layers-toggle CSS.

Updated jsfiddle: https://jsfiddle.net/v95h1kx4/5/