Symptomatic:

I'm trying to send a message to my boyfriend using Gtalk (web based)(under Gmail). The issue was that he not able to click on minimize, maximize and both of all buttons in the task bar. I strongly believe that depend on incorrect z- index positions at an element. As I will explain later this the situation can be reproduced the only with 98х1744 resolution. (http://prntscr.com/gh0l9n)
I wasn't exploring the boundaries but I'm sure with this screen resolution.

Steps to reproduce:

1. Open Chrome or Firefox  
2. Login to Gmail (machine one)
3. Minimize a browser to 98х1744 resolution.
4. Repeat last steps on another computer (machine two)
5. Send messages from machine one to machine two using Gtalk
6. Machine two using a resolution 98х1744 - the user can't use minimize, maximize and close the window because login, logout, settings have bigger z- 
index and override it. 

Acceptance criteria:

1. Work correctly on modern browsers
2. Work on Chrome, Firefox
3. What I see: Work only in Internet Explorer 11

Tested on: Version 60.0.3112.90 (Official Build) (64-bit)
Tested on: Internet Explorer 11
Tested on: Firefox 55.0.3 (32 bit version)

Please if you want some help contact me. 

Best regards Blaga Vladinova
 

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