SASS Mixin for Breakpoints

breakpoints.scss

@mixin bpmax($breakpoint) {
    @media all and (max-width:($breakpoint+px)) {
        @content;
    }
}
@mixin bpmin($breakpoint) {
    @media all and (min-width:($breakpoint+px)) {
        @content;
    }
}
@mixin bpminmax($breakpointmin, $breakpointmax) {
    @media all and (min-width:($breakpointmin+px)) and (max-width:($breakpointmax+px)) {
        @content;
    }
}