# Custom UI (with Bootstrap) The editor below runs a completely custom user interface written in [Bootstrap](http://getbootstrap.com/), while the editing is provided by CKEditor 5. ## Detailed guide If you would like to create this interface on your own, read the [dedicated tutorial](../../framework/deep-dive/ui/external-ui.md) that shows how to achieve this step by step with the source code provided. --- Full index of the CKEditor 5 documentation: [llms.txt](../../../llms.txt)