scss/mixins/_width.scss

_width.scss

$breakpoints: (
  xs: 600px,
  sm: 800px,
  md: 1000px,
  lg: 1200px,
  xl: 1500px,
);

@mixin respond-above-width($breakpoint) {
  @if map-has-key($breakpoints, $breakpoint) {
    $breakpoint-value: map-get($breakpoints, $breakpoint);

    @media (min-width: $breakpoint-value) {
      @content;
    }
  } @else {
    @warn 'Invalid breakpoint: #{$breakpoint}.';
  }
}

@mixin respond-below-width($breakpoint) {
  @if map-has-key($breakpoints, $breakpoint) {
    $breakpoint-value: map-get($breakpoints, $breakpoint);

    @media (max-width: ($breakpoint-value - 1)) {
      @content;
    }
  } @else {
    @warn 'Invalid breakpoint: #{$breakpoint}.';
  }
}

@mixin respond-between-width($lower, $upper) {
  @if map-has-key($breakpoints, $lower) and map-has-key($breakpoints, $upper) {
    $lower-breakpoint: map-get($breakpoints, $lower);
    $upper-breakpoint: map-get($breakpoints, $upper);

    @media (min-width: $lower-breakpoint) and (max-width: ($upper-breakpoint - 1)) {
      @content;
    }
  } @else {
    @if (map-has-key($breakpoints, $lower) ==false) {
      @warn 'Your lower breakpoint was invalid: #{$lower}.';
    }

    @if (map-has-key($breakpoints, $upper) ==false) {
      @warn 'Your upper breakpoint was invalid: #{$upper}.';
    }
  }
}