.container_fluid 与 .container 的区别

.container{
    padding-right:15px;
    padding-left:15px;
    margin-right:auto;
    margin-left:auto
}

@media (min-width:768px){
    .container{
        width:750px
    }

}

@media (min-width:992px){
    .container{
        width:970px
    }

}

@media (min-width:1200px){
    .container{
        width:1170px
    }

}