Try having images under src/ for relative path

src/components/Calculator.tsx

@@ -90,10 +90,11 @@ export class Calculator extends React.PureComponent<Props> {
           Points: {availablePoints}
         </div>
 
-        <div>
-          <a href="/shaman/-5505000055523051-55">Shaman test</a>
-          <a href="/shaman/-5595000055523051-55">Shaman test broken</a>
-        </div>
+        <ul>
+          <li><a href="/shaman/-5505000055523051-55">Shaman test</a></li>
+          <li><a href="/shaman/-5595000055523051-55">Shaman test broken</a></li>
+          <li><a href="/rogue/-005055-50205302332212051">Rogue can unlearn first row</a></li>
+        </ul>
       </div>
     )
   }

src/components/Icon.scss

@@ -34,7 +34,7 @@
 
   &--golden {
     .icon__frame {
-      background-image: url('/images/icons/large/gold.png');
+      background-image: url('../images/icons/large/gold.png');
     }
   }
 
@@ -50,7 +50,7 @@
     height: 44px;
     top: -2px;
     left: -2px;
-    background-image: url('/images/icons/large/default.png');
+    background-image: url('../images/icons/large/default.png');
     background-repeat: no-repeat;
     background-size: contain;
   }

src/components/TalentSlot.scss

@@ -58,7 +58,7 @@
     height: 46px;
     bottom: -1px;
     left: -4px;
-    background-image: url('/images/icons/large/default.png');
+    background-image: url('../images/icons/large/default.png');
     background-size: cover;
 
     &:after {

src/components/TalentTree.tsx

@@ -25,7 +25,7 @@ export const TalentTree: React.FC<Props> = ({ specId, knownTalents, availablePoi
   )
 
   const bodyStyle = { 
-    backgroundImage: `url(/images/specs/${specId}.jpg)`
+    backgroundImage: `url(${require(`../images/specs/${specId}.jpg`)})`
   }
 
   const arrows = talents

src/index.css

@@ -1,13 +0,0 @@
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}

src/index.tsx

@@ -1,17 +1,16 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
-import * as serviceWorker from './serviceWorker';
+import React from 'react'
+import ReactDOM from 'react-dom'
+import App from './App'
+import * as serviceWorker from './serviceWorker'
 
 if (process.env.NODE_ENV !== 'production') {
   const whyDidYouRender = require('@welldone-software/why-did-you-render/dist/no-classes-transpile/umd/whyDidYouRender.min.js')
   whyDidYouRender(React)
 }
 
-ReactDOM.render(<App />, document.getElementById('root'));
+ReactDOM.render(<App />, document.getElementById('root'))
 
 // If you want your app to work offline and load faster, you can change
 // unregister() to register() below. Note this comes with some pitfalls.
 // Learn more about service workers: https://bit.ly/CRA-PWA
-serviceWorker.unregister();
+serviceWorker.unregister()