Gulp task to scale all css pixel values down by 10%

gistfile1.js

var replace = require('gulp-replace');

gulp.task('resizeCSS', function() {
  gulp.src(['clients/unata/styles/*.styl', 'clients/unata/styles/**/*.styl'])
    .pipe(replace(/([0-9]+\.?[0-9]*)px/g, function(match, size) {
      if(size > 0){
        size = Math.max(1, Math.round(size * 0.9));
      }
      return size + 'px';
    }))
    .pipe(gulp.dest('clients/unata/styles'));
});