Sass breakpoint mixin

bp.scss

@mixin bp($point) {
    @if $point==xl {
        @media (min-width: 85rem) {
            @content;
        }
    }
    @else if $point==l {
        @media (min-width: 70rem) {
            @content;
        }
    }
    @else if $point==ml {
        @media (min-width: 55rem) {
            @content;
        }
    }
    @else if $point==m {
        @media (min-width: 45rem) {
            @content;
        }
    }
    @else if $point==ms {
        @media (min-width: 38rem) {
            @content;
        }
    }
    @else if $point==s {
        @media (min-width: 35rem) {
            @content;
        }
    }
}