Bootstrap 4 with two additional breakpoints:
xxl-min-width: 1900px(desktops at full screen)xxxl-min-width: 3000px(4k at full or near full screen)
Use these as you would other breakpoints, e.g. <div class='col-12 col-md-6 col-lg-4 col-xl-3 col-xxl-2'>. The container max-width is increased for these breakpoints as well. See it in action at thunderblaster.github.io/bootstrap-xxl.
To use, simply download and link dist/css/bootstrap.min.css and dist/js/bootstrap.min.js, or the non-minified or bundled version if you prefer.
Now available from npm!
npm install bootstrap-xxl