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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/index.php
Line: 315
Function: require_once

Bootstrap 3 has nice CSS classes in responsive utilities that allow me to hide or show some blocks depending upon the screen resolution http://getbootstrap.com/css/#responsive-utilities-classes

I have some style rules in a CSS file that I want to be applied or not based on screen resolution.

How can I do it?

I'm going to minimize all my CSS files into the one on production deployment, but this could be avoided if there are no other solutions than having separate CSS files for different screen resolutions.

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