Container css from bootstrap

container.css

.container {
    margin-right:auto;
    margin-left:auto;
    padding-left:15px;
    padding-right:15px
}
.container:after, .container:before {
    content:" ";
    display:table
}
.container:after {
    clear:both
}
@media (min-width:768px) {
    .container {
        width:750px
    }
}
@media (min-width:992px) {
    .container {
        width:970px
    }
}
@media (min-width:1200px) {
    .container {
        width:1170px
    }
}