Generated by SassMeister.com.

SassMeister-input.scss

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

@mixin responsive($size) {
  @media (min-width: map-get($container-max-widths, $size)) {
    @content
  }
}

$container-max-widths: (
  sm: 34rem, // 480
  md: 45rem, // 720
  lg: 60rem, // 960
  xl: 72.25rem // 1140
) !default;

@include responsive('sm') {
  .bou {
    width: 1em;
  }
}

SassMeister-output.css

@media (min-width: 34rem) {
  .bou {
    width: 1em;
  }
}