Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.1.0)
// ----

$fontSansSerif : 'Helvetica Neue', Helvetica, '\30D2\30E9\30AE\30CE\89D2\30B4\20\50\72\6F\20\57\33', 'Hiragino Kaku Gothic Pro', '\30E1\30A4\30EA\30AA', Meiryo, '\FF2D\FF33\20\FF30\30B4\30B7\30C3\30AF', sans-serif;
html {
  font-family: $fontSansSerif;
  background: url(hoge.png);
  background: url('hoge.png');
  background: url("hoge2.png");
  width: #{'14.285715286'}%;
  width: 14.285714286%;
  width: 141.285714286%;
}
.block {
  width: 100px;
  height: 50px;
}
.block2 {
  @extend .block;
}

SassMeister-output.css

html {
  font-family: 'Helvetica Neue', Helvetica, '\30D2\30E9\30AE\30CE\89D2\30B4\20\50\72\6F\20\57\33', 'Hiragino Kaku Gothic Pro', '\30E1\30A4\30EA\30AA', Meiryo, '\FF2D\FF33\20\FF30\30B4\30B7\30C3\30AF', sans-serif;
  background: url(hoge.png);
  background: url('hoge.png');
  background: url("hoge2.png");
  width: 14.285715286%;
  width: 14.28571%;
  width: 141.28571%; }

.block, .block2 {
  width: 100px;
  height: 50px; }