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Bootstrap Example
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.col-xs-7 .col-sm-6 .col-lg-8
.col-xs-5 .col-sm-6 .col-lg-8
.col-xs-6 .col-sm-8 .col-lg-10
.col-xs-6 .col-sm-4 .col-lg-2
.col-xs-6
.col-xs-6