@import "_mediaqueries";

$l1: (red, blue, green);
$l2: (300px, 200px, 100px);

$br1: 1920;
$br2: 980;
$br3: 640;

.example_mbr {
    background-color: red;
    width: 300px;
    height: 300px;

    @include mbr($br1, $br2, $br3) using ($i) {
        width: nth($l2, $i);
        height: nth($l2, $i);
        background-color: nth($l1, $i);
    }
}