Generated by SassMeister.com.

SassMeister-input.sass

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

$gutter:      30px
$gutter-half: $gutter / 2

$baseline-step:     6px
$baseline-x-small:  $baseline-step * 2 // 12px
$baseline-small:    $baseline-step * 3 // 18px
$baseline-base:     $baseline-step * 4 // 24px
$baseline-large:    $baseline-step * 5 // 30px
$baseline-x-large:  $baseline-step * 6 // 36px
$baseline-xx-large: $baseline-step * 7 // 42px

$font-size-base: 14px

@function remove-unit($num)
  @return $num / ($num * 0 + 1)

// Mixin

=rem($property, $values)

  $root: remove-unit($font-size-base)

  $px-values:  ()
  $rem-values: ()

  @each $value in $values

    @if $value == 0 or type-of($value) != "number"
      $px-values:  append($px-values,  $value)
      $rem-values: append($rem-values, $value)

    @else
      $unit: unit($value)
      $val:  remove-unit($value)

      @if $unit == "px"
        $px-values:  append($px-values,  ($val + px))
        $rem-values: append($rem-values, ($val / $root + rem))

      @if $unit == "rem"
        $px-values:  append($px-values,  ($val * $root + px))
        $rem-values: append($rem-values, ($val + rem))

  @if $rem-values == $px-values
    #{$property}: $rem-values

  @else
    #{$property}: $px-values
    #{$property}: $rem-values
    
=background-svg($file-name, $size...)

  background-image: image-url("#{$file-name}.png")
  background-image: image-url("#{$file-name}.svg")

  @if length($size) > 0
    +rem(background-size, $size)

.i-video-story-play
  +background-svg("circle-play-btn-blue", 100% 100%)
  background-repeat: no-repeat
  +rem(height, $baseline-large)
  +rem(margin, $baseline-small auto)
  +rem(width, $gutter)

SassMeister-output.css

.i-video-story-play {
  background-image: image-url("circle-play-btn-blue.png");
  background-image: image-url("circle-play-btn-blue.svg");
  background-size: 100% 100%;
  background-repeat: no-repeat;
  height: 30px;
  height: 2.14286rem;
  margin: 18px auto;
  margin: 1.28571rem auto;
  width: 30px;
  width: 2.14286rem;
}