@mixin respond-to($breakpoint) {
  // If the key exists in the map
  @if map-has-key($breakpoints, $breakpoint) {
    // Prints a media query based on the value
    @media (min-width: map-get($breakpoints, $breakpoint)) {
      @content;
    }
  } @else {
    @media (min-width: $breakpoint) {
      @content;
    }
  }
}

@mixin respond-to-max($breakpoint) {
  // If the key exists in the map
  @if map-has-key($breakpoints, $breakpoint) {
    // Prints a media query based on the value
    @media (max-width: map-get($breakpoints, $breakpoint)) {
      @content;
    }
  } @else {
    @media (max-width: $breakpoint) {
      @content;
    }
  }
}