Generated by SassMeister.com.

SassMeister-input.scss

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

@mixin breakpoint($breakpoint) {
  
    // The following code no longer works in libSass 3.3.0
    // It will return an error and say it can't pass a content block
    //Check if the value passed in is a unitless number
    @if not unitless($breakpoint) {
        //Pass an error if not unitless.
        @error 'Your value for `$breakpoint` is not unitless. Please try again.';

    } @else {
        $bp: ($breakpoint / 16) * 1em;

        //Set Media Query and pass through a number.
        @media screen and (min-width: $bp) {
            @content;
        }
    }
}

@include breakpoint(600) {
  .element {
    width: 480px;
  }
}

SassMeister-output.css

@media screen and (min-width: 37.5em) {
  .element {
    width: 480px;
  }
}