fix buttons

client/src/App.js

@@ -41,9 +41,11 @@ class App extends Component {
           <LetterOptions onChange={this._onChange.bind(this)} {...state.options}/>
           <LatestList latest={state.latest} clickHandler={this._onClickLatest.bind(this)} />
         </div>
+        <div>
           <div>
             <Button onClick={this._onGenerate.bind(this)} text="Backe PDF"/>
             <Button onClick={this._onClear.bind(this)} text="Alles Löschen"/>
+          </div>
           <Preview
             pdfUrl={state.pdfUrl}
             pdfIsLoading={state.pdfIsLoading}