Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="block"></div>

SassMeister-input.scss

// ----
// libsass (v0.8.6)
// ----

$image: "http://upload.wikimedia.org/wikipedia/commons/b/b0/NewTux.svg";

.block {
  background: url(#{$image}) no-repeat 50% 0;
  background-size: 90%;
  width: 500px;
  height: 500px;
  background-color: orange;
}

SassMeister-output.css

.block {
  background: url(http://upload.wikimedia.org/wikipedia/commons/b/b0/NewTux.svg) no-repeat 50% 0;
  background-size: 90%;
  width: 500px;
  height: 500px;
  background-color: orange; }

SassMeister-rendered.html

<div class="block"></div>