diff --git a/package.json b/package.json
index 4fd58d5..71fbb4b 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,9 @@
   "description": "JavaScript SDK for Veriff identity verification",
   "main": "lib/veriff.js",
   "scripts": {
-    "build": "webpack",
+    "build": "webpack --config webpack/prod.config.js",
     "dev": "webpack --progress --colors --watch --config webpack/prod.config.js",
-    "test": "./node_modules/karma/bin/karma start ./scripts/karma.conf.js --config webpack/prod.config.js"
+    "test": "./node_modules/karma/bin/karma start ./scripts/karma.conf.js"
   },
   "author": "Ilia Aphtsiauri <ilia@veriff.me> (https://github.com/iaptsiauri)",
   "keywords": [
diff --git a/scripts/karma.conf.js b/scripts/karma.conf.js
index 92b9d70..71832ef 100644
--- a/scripts/karma.conf.js
+++ b/scripts/karma.conf.js
@@ -1,4 +1,4 @@
-const baseConfig = require('../webpack/base.config');
+const baseConfig = require('../webpack/test.config');
 
 module.exports = function (config) {
 
diff --git a/webpack/base.config.js b/webpack/base.config.js
index abec63a..c052496 100644
--- a/webpack/base.config.js
+++ b/webpack/base.config.js
@@ -44,8 +44,7 @@ module.exports = {
     module: {
         loaders: [
             { test: /(\.js)$/, loader: 'babel-loader', exclude: /node_modules/ },
-            { test: /(\.js)$/, loader: 'eslint-loader', exclude: /node_modules/ },
-            { test: /\.css$/, loader: 'style-loader!css-loader', exclude: /node_modules/ }
+            { test: /(\.js)$/, loader: 'eslint-loader', exclude: /node_modules/ }
         ]     
     },
     resolve: {
diff --git a/webpack/prod.config.js b/webpack/prod.config.js
index 229a899..3bc22f5 100644
--- a/webpack/prod.config.js
+++ b/webpack/prod.config.js
@@ -3,41 +3,43 @@ const merge = require('webpack-merge');
 const baseConfig = require('./base.config.js');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
 
-const config = merge(baseConfig, {
-  entry: `${__dirname}/src/index.js`,
-  devtool: 'source-map',
-  module: {
-    loaders: [
-        {  test: /\.css$/,
+const umdConfig = merge(baseConfig, {
+    entry: `${__dirname}/../src/index.js`,
+    devtool: 'source-map',
+    module: {
+        loaders: [{
+            test: /\.css$/,
             use: ExtractTextPlugin.extract({
-              fallback: "style-loader",
-              use: "css-loader"
+                fallback: "style-loader",
+                use: "css-loader"
             })
-        }
-    ]
-  },
-  plugins: [
-    new ExtractTextPlugin("styles.css")
-  ]
+        }]
+    },
+    plugins: [
+        new ExtractTextPlugin("styles.css")
+    ],
+    output: {
+        path: `${__dirname}/../dist`,
+        filename: 'veriff.min.js',
+        library: libraryName,
+        libraryTarget: 'umd',
+        umdNamedDefine: true
+    }
 });
 
-const umdConfig = Object.assign({}, config, {
-  output: {
-    path: `${__dirname}/dist`,
-    filename: 'veriff.min.js',
-    library: libraryName,
-    libraryTarget: 'umd',
-    umdNamedDefine: true
-  }
+const npmConfig = merge(baseConfig, {
+    entry: `${__dirname}/../src/index.js`,
+    devtool: 'source-map',
+    module: {
+        loaders: [
+            { test: /\.css$/, loader: 'style-loader!css-loader', exclude: /node_modules/ }
+        ]
+    },
+    output: {
+        path: `${__dirname}/../lib`,
+        filename: 'veriff.js',
+        libraryTarget: 'commonjs2'
+    }
 });
 
-const npmConfig = Object.assign({}, config, {
-  output: {
-    path: `${__dirname}/lib`,
-    filename: 'veriff.js',
-    libraryTarget: 'commonjs2'
-  }
-});
-
-
-module.exports = [ umdConfig,  npmConfig ];
+module.exports = [umdConfig, npmConfig];
\ No newline at end of file
diff --git a/webpack/test.config.js b/webpack/test.config.js
new file mode 100644
index 0000000..99bdb53
--- /dev/null
+++ b/webpack/test.config.js
@@ -0,0 +1,10 @@
+const merge = require('webpack-merge');
+const baseConfig = require('./base.config.js');
+
+module.exports = merge(baseConfig, {
+    module: {
+        loaders: [
+            { test: /\.css$/, loader: 'style-loader!css-loader', exclude: /node_modules/ }
+        ]
+    }
+});
\ No newline at end of file