# Importing EcmaScript modules from sources
Please note that this is not possible with the trial, sources are only included in the paid version.
## Include CSS
Include the CSS for the theme you want to use on page:
```html
```
## Import the classes you need
In your application code, import the classes you need from their source file. All source files are located under `lib/`
and they all offer a default export. Please note that if you want to support older browsers you need to transpile and
bundle your code since ES modules are only supported in modern browsers.
```javascript
import Gantt from '../lib/Gantt/view/Gantt.js';
```
And then use them:
```javascript
const gantt = new Gantt({
/* Gantt configuration options */
})
```
Almost all included demos use this technique, see for example the Basic example.