Output files can now be downloaded using FileSaver (supports large files ~500MB)

src/web/html/index.html

@@ -222,7 +222,7 @@
                                         <img aria-hidden="true" src="<%- require('../static/images/cyberchef-256x256.png') %>" alt="File icon"/>
                                         <div class="card-body">
                                             Size: <span id="output-file-size"></span><br>
-                                            Download<br>
+                                            <button id="output-file-download" type="button" class="btn btn-primary btn-sm">Download</button><br>
                                             Display in output<br>
                                             Options for how much to display
                                         </div>