To add a custom widget to your website in the Matrix theme admin menu, navigate to Shortcodes, select any widget by clicking the Copy button. Then, paste the code inside the Widget/HTML module of your website.
In the Matrix theme's admin menu, select "Block elements" and choose any full-width widget. Just like widgets from Shortcodes, paste the code inside the Widget/HTML module.
Please note that, unlike the shortcodes widgets that can be used as a standalone widget or inside the columns, the code for Block sections cannot be pasted into the Widgets/HTML module inside the Columns unless you are using only one column.
This type of widget is referred to as "fluid" since you can drag and drop, resize, delete, and add various elements inside the editing area.
The code for Fluid sections should be pasted inside the Text module and not the Widget/HTML.If you add the code inside Widget/HTML, you'll have a simple static widget.
01. Add a module "Text"
02. Click the button "Edit HTML"
03. Paste the code inside the Source code and click "OK" and then "Save" button.
04. In order to activate the sizing option, click the button "apply the style" of the style editor.
Additional widgets and plugins can be found in the "Matrix Add-ons" section. Here, you will also discover further customized default widgets from Shortcodes, including buttons, animations, etc.