Only grid and responsive classes

1. npm install bootstrap-3-grid --save
2. Include this file bootstrap-3-grid.css

This style contains only grid and responsive classes. Bootstrap 3 based on box-sizing. To include box-sizing in your project click here or read below:

html {
  box-sizing: border-box;
}
*,
*:before,
*:after {
  box-sizing: inherit;
}