css - Apply class depending on media query screen size -

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i using twitter bootstrap. have btn-group. want btn-group , btn-group-justified classes added screens @ or above 768px, , btn-group-vertical class applied screens @ or below 767px. what's easiest way this?

this jquery implementation. if can't change ids classes on buttons, best way can think of it.

$(document).ready(function(){   var changewidth = function(){     if ( $(window).width() < 768 ){     $('.btn-group-justified').removeclass('btn-group-justified').addclass('btn-group-vertical');     } else {       $('.btn-group-vertical').removeclass('btn-group-vertical').addclass('btn-group-justified');     }   };   $(window).resize(changewidth); });

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