Responsive webpage design [closed]
Normand gretchen shelby
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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
My webpage looks like the following picture: 
I made it user responsive across all devices.
My HTML and CSS code is given below for the webpage shown above:
Background Top
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I am using Bootstrap 4 and I am currently working to make it more efficient. If anyone have any suggestions, please comment below! Thanks!
