This plugin is outdated and might not be supported anymore
Responsive CSS EDITOR

Responsive CSS EDITOR

By WP WOX
Details
View on WordPress

This plugin simplifies the process of adding responsive css and creating breakpoints. It reduces code redundancy of declaring breakpoints. Also, it provides field to add css regardless of resposiveness under the custom css metabox. After installation, five breakpoints are created by default. You can delete those breakpoints or add new breakpoints and also order them as desired.

Plugin Documentation:
http://www.wpwox.com/responsive-css-editor/

Details

Plugin code:
responsive-css-editor
Plugin version:
1.0
Author:
Outdated:
Yes
WP version:
3 or higher
PHP version:
or higher
Test up to WP version:
4.4.33
Total installations:
400
Last updated:
2016-01-19
Rating:
Times rated:
3
css-editor
custom-css
responsive-css
responsive-custom-style
wpwox