<div class="row"> <div style="background-color:red" class="col-md-3 col-sm-4 col-xs-12">青青子衿,悠悠我心。纵我不往,子宁不嗣音?</div> <div style="background-color:green" class="col-md-6 col-sm-8 col-xs-12">青青子佩,悠悠我思。纵我不往,子宁不来? </div> <div style="background-color:yellow" class="col-md-3 col-sm-12 col-xs-12">挑兮达兮,在城阙兮。一日不见,如三月兮。 </div>