It works!!!

package.json

@@ -17,8 +17,10 @@
     "flow-bin": "^0.38.0",
     "react": "^15.4.2",
     "react-dom": "^15.4.2",
+    "semantic-ui-css": "^2.2.4",
     "semantic-ui-react": "^0.64.4",
     "style-loader": "^0.13.1",
+    "url-loader": "^0.5.7",
     "webpack": "2",
     "webpack-dev-server": "2"
   },

src/App.js

@@ -4,7 +4,10 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 
 import Layout from './Layout';
-import { Button } from 'semantic-ui-react'
+import { Button } from 'semantic-ui-react';
+
+import 'semantic-ui-css/semantic.css';
+import 'semantic-ui-css/semantic.js';
 
 const ButtonExampleEmphasis = () => (
   <div>

webpack.config.js

@@ -1,4 +1,5 @@
 var path = require("path");
+var webpack = require("webpack");
 
 const config = {
   devtool: "#source-maps",
@@ -20,11 +21,19 @@ const config = {
       },
       {
         test: /\.css$/,
-        exclude: /node_modules/,
         use: ["style-loader", "css-loader"]
+      },
+      {
+        test: /\.(eot|woff|woff2|ttf|svg|png|jpg)$/,
+        use: ["url-loader"]
       }
     ]
   },
+  plugins: [
+    new webpack.ProvidePlugin({
+      'jQuery': 'jquery'
+    })
+  ],
   devServer: {
     contentBase: path.join(__dirname, "public")
   },

yarn.lock

@@ -1937,6 +1937,10 @@ jodid25519@^1.0.0:
   dependencies:
     jsbn "~0.1.0"
 
+jquery@x.*:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.1.1.tgz#347c1c21c7e004115e0a4da32cece041fad3c8a3"
+
 js-base64@^2.1.9:
   version "2.1.9"
   resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.1.9.tgz#f0e80ae039a4bd654b5f281fc93f04a914a7fcce"
@@ -2036,7 +2040,7 @@ loader-runner@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/loader-runner/-/loader-runner-2.2.0.tgz#824c1b699c4e7a2b6501b85902d5b862bf45b3fa"
 
-loader-utils@^0.2.11, loader-utils@^0.2.16, loader-utils@^0.2.7, loader-utils@~0.2.2:
+loader-utils@0.2.x, loader-utils@^0.2.11, loader-utils@^0.2.16, loader-utils@^0.2.7, loader-utils@~0.2.2:
   version "0.2.16"
   resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-0.2.16.tgz#f08632066ed8282835dff88dfb52704765adee6d"
   dependencies:
@@ -2139,6 +2143,10 @@ mime-types@^2.1.12, mime-types@~2.1.11, mime-types@~2.1.13, mime-types@~2.1.7:
   dependencies:
     mime-db "~1.26.0"
 
+mime@1.2.x:
+  version "1.2.11"
+  resolved "https://registry.yarnpkg.com/mime/-/mime-1.2.11.tgz#58203eed86e3a5ef17aed2b7d9ebd47f0a60dd10"
+
 mime@1.3.4, mime@^1.3.4:
   version "1.3.4"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.3.4.tgz#115f9e3b6b3daf2959983cb38f149a2d40eb5d53"
@@ -3008,6 +3016,12 @@ select-hose@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/select-hose/-/select-hose-2.0.0.tgz#625d8658f865af43ec962bfc376a37359a4994ca"
 
+semantic-ui-css@^2.2.4:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/semantic-ui-css/-/semantic-ui-css-2.2.4.tgz#e886e6e55e2a16874bd5de49c25f26cd2eb720b7"
+  dependencies:
+    jquery x.*
+
 semantic-ui-react@^0.64.4:
   version "0.64.4"
   resolved "https://registry.yarnpkg.com/semantic-ui-react/-/semantic-ui-react-0.64.4.tgz#95b29fd3d4885e05f7aa3cb1497ebe73c99df027"
@@ -3386,6 +3400,13 @@ unpipe@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
 
+url-loader@^0.5.7:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/url-loader/-/url-loader-0.5.7.tgz#67e8779759f8000da74994906680c943a9b0925d"
+  dependencies:
+    loader-utils "0.2.x"
+    mime "1.2.x"
+
 url-parse@1.0.x:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.0.5.tgz#0854860422afdcfefeb6c965c662d4800169927b"