diff --git a/BuildServer/lib/tasks/cssnano.js b/BuildServer/lib/tasks/cssnano.js
new file mode 100644
index 0000000..3b55f76
--- /dev/null
+++ b/BuildServer/lib/tasks/cssnano.js
@@ -0,0 +1,35 @@
+"use strict";
+
+const fs = require('fs');
+const path = require('path');
+const cssnano = require("cssnano");
+
+module.exports = (params, processor) => ({
+	process: () => {
+		const filePath = path.normalize(processor.context.exported + "/" + params.filename);
+		fs.readFile(filePath, (err, css) => {
+			if (err) {
+				processor.onError("Unable to read stylesheet " + params.filename + ": " + err);
+				return processor.done();
+			}
+
+			cssnano.process(css)
+				.catch((err) => {
+					processor.onError("Unable to uglify stylesheet: " + err);
+					processor.done();
+				})
+				.then((result) => {
+					fs.writeFile(filePath, result.css, (err) => {
+						if (err) {
+							processor.onError("Unable to write uglified stylesheet for " + params.filename + ": " + err);
+						} else {
+							processor.onInfo("Saved uglified stylesheet for " + params.filename + "; uglified length: " + result.css.length);
+						}
+
+						processor.done();
+					});
+				});
+                });
+	}
+});
+
diff --git a/BuildServer/lib/tasks/cssnanoall.js b/BuildServer/lib/tasks/cssnanoall.js
new file mode 100644
index 0000000..1942401
--- /dev/null
+++ b/BuildServer/lib/tasks/cssnanoall.js
@@ -0,0 +1,36 @@
+"use strict";
+
+const glob = require('glob');
+
+module.exports = (params, processor) => ({
+	process: () => {
+		if (processor.context.cssnanoallDone) {
+			processor.onWarn("cssnanoall task is executed more than once; this is probably a bug in your mbs.json");
+		}
+
+		processor.context.cssnanoallDone = true;
+
+		glob("**/*.css", {
+			dot: true,
+			cwd: processor.context.exported
+		}, (err, files) => {
+			if (err) {
+				processor.onError(err);
+				return processor.done();
+			}
+
+			return processor.processTask({
+				type: params.preventParallelTests ? "sequential" : "parallel",
+				params: {
+					tasks: files.map((file) => ({
+						name: file,
+						type: "cssnano",
+						params: {
+							filename: file
+						}
+					}))
+				}
+			}, processor.done.bind(processor));
+		});
+	}
+});
diff --git a/BuildServer/lib/tasks/packform.js b/BuildServer/lib/tasks/packform.js
index 04f45f3..4f20225 100644
--- a/BuildServer/lib/tasks/packform.js
+++ b/BuildServer/lib/tasks/packform.js
@@ -7,6 +7,9 @@ module.exports = (params, processor) => sequential({
 		{
 			type: "uglifyjsall"
 		},
+		{
+			type: "cssnanoall"
+		},
 		{
 			type: "zip",
 			params: {
diff --git a/BuildServer/package.json b/BuildServer/package.json
index cf27806..e91f265 100644
--- a/BuildServer/package.json
+++ b/BuildServer/package.json
@@ -9,6 +9,7 @@
     "adm-zip": "0.4.7",
     "async": "~2.1.4",
     "body-parser": "^1.15.2",
+    "cssnano": "^3.9.1",
     "express": "4.14.0",
     "fs-extra": "^1.0.0",
     "github": "~7.1.0",