'How to resize Tawk.to mobile widget icon size

first of all sorry for my explanation, I'm just a beginner!
I needed help with resizing the tawk.to chat icon size on mobile devices.

It's currently like so:

**.tawk-min-container .tawk-button-circle.tawk-button-large {
    width: 60px;
    height: 60px;
}**

Should also mention that NO CSS code is working from my side, since the source is external and kind of forced..?

I need it to be something like 40px. Any suggestion to override their original code. Probably trough php function?

Thanks in advance! :)

tawk.to

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