GitHub - syaifulsz/bootstrap-helper-margin-padding: A responsive Bootstrap 3 helper to add spacing or gutter with margin and padding in to block or inline-block elements.
Alignment, margin, and padding for layout - Windows apps | Microsoft Docs
Bootstrap: Modify the Gutter Padding from Columns
Responsive Columns: Build Layouts With Custom HTML Tags
The Subtle Magic Behind Why the Bootstrap 3 Grid Works | by Erik Flowers | Medium
How to remove gutter space for a specific div in Bootstrap ? - GeeksforGeeks