Bootstrap--a label with Col-xs, COL-SM, COL-MD, COL-LG

. col-xs-Ultra Small Screen phone (<768px)

. col-sm-Small Screen tablet (≥768px)

. col-md-Medium-screen desktop display (≥992px)

. col-lg-Large-screen large desktop display (≥1200px)

HTML code:

<class= "col-xs-12 col-sm-9 col-md-6 col-lg-3">                        </ Div >

When the screen size

When less than 768px, use the corresponding style of the col-xs-12 class;

In the 768px to 992px, with the col-sm-9 class corresponding style;

In the 992px to 1200px, with the col-md-6 class corresponding style;

When greater than 1200px, use the corresponding style of the Col-lg-3 class;

Bootstrap--a label with Col-xs, COL-SM, COL-MD, COL-LG