=preserve3d()
  -webkit-transform-style: preserve-3d
  -moz-transform-style: preserve-3d
  -ms-transform-style: preserve-3d
  transform-style: preserve-3d

=encoded-svg-background($svg)
  $url: 'encodeURIComponent(#{$svg})'
  background-image: url("data:image/svg+xml;charset=utf-8,#{$url}")