How can I fix double scroll bar in Windows 10 Firefox? : #Environment

- Laravel Version : **5.1.45 (LTS)**
- PHP Version : **5.6.1**

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#Description

I have using a tlk chat integration, and I kept seeing 2 scrollbar on Windows Firefox + IE. 

Mac is fine, Chrome is fine.

[![enter image description here][1]][1] 

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#Attempt

I did some research and I've tried all of these, but none of them seem to work.

    // html, body {height:100%;}
    // html { overflow-y: scroll;}
    // * html .clearfix { height: 1%; }
    // html {overflow-y: hidden }

I've tried applied them as in file css. 
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#Question


**How would one go about and debug this ?**

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I'm opening to any suggestions at this moment.

Any hints / suggestions / helps on this be will  be much appreciated !


  [1]: https://i.stack.imgur.com/VfxcE.png
