xs: < 544px sm: 544-768px md: 768-992px lg: 992-1200px xl: >= 1200px
.hidden-xs-down .hidden-md-down .hidden-lg-down .hidden-xl-down .hidden-xs-up .hidden-sm-up .hidden-md-up .hidden-lg-up .hidden-xl-up
.visible-print-block .visible-print-inline .visible-print-inline-block .hidden-print
https://v4-alpha.getbootstrap.com/layout/responsive-utilities/