Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$breakpoints: (
  small : 480px,
  medium: 700px, // Previously 640px
  large : 1024px
);

$p-font-sizes: (
  null  : 15px,
  small : 16px,
  medium: 17px,
  900px : 18px,
  large : 19px,
  1440px: 20px,
);

$h1-font-sizes: (
  null  : 28px,
  small : 31px,
  medium: 33px,
  large : 36px
);


@mixin font-size($fs-map, $fs-breakpoints: $breakpoints) {
  @each $fs-breakpoint, $fs-font-size in $fs-map {
    @if $fs-breakpoint == null {
      font-size: $fs-font-size;
    }
    @else {
      // If $fs-font-size is a key that exists in
      // $fs-breakpoints, use the value
      @if map-has-key($fs-breakpoints, $fs-breakpoint) {
        $fs-breakpoint: map-get($fs-breakpoints, $fs-breakpoint);
      }
      @media screen and (min-width: $fs-breakpoint) {
        font-size: $fs-font-size;
      }
    }
  }
}

p {
  @include font-size($p-font-sizes);
}

SassMeister-output.css

p {
  font-size: 15px;
}

@media screen and (min-width: 480px) {
  p {
    font-size: 16px;
  }
}

@media screen and (min-width: 700px) {
  p {
    font-size: 17px;
  }
}

@media screen and (min-width: 900px) {
  p {
    font-size: 18px;
  }
}

@media screen and (min-width: 1024px) {
  p {
    font-size: 19px;
  }
}

@media screen and (min-width: 1440px) {
  p {
    font-size: 20px;
  }
}