It’s very easy to add Common Ninja’s HTML code to Contao.
1. First, you need to copy the widget’s HTML code. There are several methods to do so.
Method 1: From the Widget’s Editor
Once you’ve saved your widget, at the top right corner, to the left of the “preview” button, you will see the “Add to Website” button, represented by the “</>” symbol. Click on it.
Then, in the window that opens up, you will see the code. Simply click on the copy button next to it.
Method 2: From the Dashboard
From your user dashboard, find the widget you want to add to your website from within the “Widgets” tab. Next to it, and under the “Actions” heading (on the right side), you will see a purple button with “Add to Site” on it. Click on it.
A window will pop up, and here, simply click on the copy button next to the code to copy it.
2. When working with your Contao page, in the text editor, you will notice two opposing arrows. This is the HTML feature. Click on it and paste the code you’ve copied. Save and exit and you should have Common Ninja’s app on your page.
Source: Contao