.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto
}

@media(min-width: 576px) {
    .container {
        max-width:540px
    }
}

@media(min-width: 768px) {
    .container {
        max-width:720px
    }
}

@media(min-width: 992px) {
    .container {
        max-width:960px
    }
}

@media(min-width: 1200px) {
    .container {
        max-width:1140px
    }
}