1<===> input.scss
2foo {
3    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="data:image/png;base64,ABCD",sizingMethod=crop);
4}
5
6<===> output.css
7foo {
8  filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="data:image/png;base64,ABCD",sizingMethod=crop);
9}
10