.bag{margin-left:auto;margin-right:auto;padding:0px;box-sizing:border-box}
.bag.fluid{margin:0 auto}
.bag.fixed{max-width:100%}@media(min-width:768px){.bag.fixed{width:750px}}@media(min-width:992px){.bag.fixed{width:970px}}@media(min-width:1200px){.bag.fixed{width:1170px}}