.calc(@prop; @val) {
  @{prop}: calc(~'@{val}');
  @{prop}: -moz-calc(~'@{val}');
  @{prop}: -webkit-calc(~'@{val}');
  @{prop}: -o-calc(~'@{val}');
}
@winheight:`$(window).height()`;
html {
  body {
    min-height: ~"@{winheight}px";
  }
}

#container {
  .calc(height; "@{winheight}px - 150px");
}

#content {
  .calc(min-height; "100% - 120px");
}