mnmum/partials/_layout.sss

/* Layout */
@import '../variables.sss'

nav, nav > ul, nav > ul li, body > header, body > main, footer, footer > ul
    display: flex
    justify-content: center
    position: relative
    z-index: $zcontent

._maxwidth
    width: 480px

@media (min-width: 768px)
    ._maxwidth
        width: 600px

@media (min-width: 1080px)
    ._maxwidth
        width: 960px

@media (min-width: 1200px)
    ._maxwidth
        width: 1080px

@media (min-width: 1920px)
    ._maxwidth
        width: $maxwidth