Please note that is you want to embed custom code to your Webflow site, you need a paid Webflow account or active site plan. Log in to your Webflow account and navigate to the project you want to add the widget to.
Select the page where you want to add the widget and click on the "Add Element" button in the toolbar.
Choose the "Embed" element from the list of available elements.
A new Embed element will be added to your page. Paste the widget code in the appeared Code Editor. To see your widget working, check your site online.
Please note that the appearance of your widget may depend on your website's styles. Avoid adding your widgets to existing elements or blocks if possible. Certain features might be blocked on some platforms.