Bootstrap 4 - Управление margin и padding отступами - ИТ Шеф
Bootstrap Margin | Complete Guide to Bootstrap Margin with Examples
Bootstrap margin and padding classes - Spacing Explained with 5 Examples
Bootstrap Spacing | o7planning.org
Bootstrap Padding | How Padding works in Bootstrap? (Examples)
Bootstrap Padding - free examples & tutorial
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.
Padding percent in container-fluid in Bootstrap - Stack Overflow