Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.3)
// Compass (v1.0.0.alpha.18)
// ----

$guss-rem-baseline: 10px !default;

// Transform a value into rem
// Assuming baseline is set to 10px on :root/html
@function rem($value, $baseline: $guss-rem-baseline) {
    @if $value == 0 { @return 0; } // 0rem -> 0
    @if type-of($value) == list {
        $result: ();
        @each $e in $value {
            $result: append($result, rem($e));
        }
        @return $result;
    } @else {
        @return if(type-of($value) == number and unit($value) == px, $value / $baseline * 1rem, $value);
    }
}

// Output rem units with px fallback
// Expects $properties to be a Sass map
@mixin rem($properties) {
    @each $property, $value in $properties {
        @if (type-of($value) == number and $value != 0) {
            // Turn any value into pixels
            $value: if(unitless($value), $value * 1px, $value);
        }

        #{$property}: $value;
        #{$property}: rem($value);
    }
}

.test {
    @include rem((
        padding: 20px 0 0px 3vh,
        margin: 0 auto 20px,
        width: 300px,
        height: 350px,
        line-height: 20px,
        border-right: 1px solid white !important
    ));
}

SassMeister-output.css

.test {
  padding: 20px 0 0px 3vh;
  padding: 2rem 0 0 3vh;
  margin: 0 auto 20px;
  margin: 0 auto 2rem;
  width: 300px;
  width: 30rem;
  height: 350px;
  height: 35rem;
  line-height: 20px;
  line-height: 2rem;
  border-right: 1px solid white !important;
  border-right: 0.1rem solid white !important;
}