$big-desktop-up: (
        media:'only screen and (min-width: 1680px)'
);
$desktop-up: (
        media:'only screen and (min-width: 1440px)'
);
$laptop-up: (
        media:'only screen and (min-width: 1280px)'
);
$tablet-landscape-up: (
        media:'only screen and (min-width: 900px)'
);
$tablet-portrait-up: (
        media:'only screen and (min-width: 600px)'
);
$phone-only: (
        media:'only screen and (max-width: 599px)'
);