PostCSS Negative Padding 
A PostCSS plugin which lets you use negative values within the padding property and creates appropriate negative margins to match.
Usage
Example:
div {
padding: -20px;
}Outputs:
div {
padding-top: 20px;
padding-right: 20px;
padding-bottom: 20px;
padding-left: 20px;
margin-top: -20px;
margin-right: -20px;
margin-bottom: -20px;
margin-left: -20px;
}Setup
npm install postcss-negative-padding --save-dev