要点一:容器、行与列
<div class="container">
<div class="row">
<div class="col-md-6"> </div>
<div class="col-md-6"> </div>
</div>
</div>
screen设置
@media(min-width:768px){
.container {width:750px;}}
@media(min-width:992px){
.container {width:970px;}}
@media(min-width:1200px){
.container {width:1170px;}}
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