## Allowed domains You can restrict which sites your widget works on. It's configured in **Settings → Widget customization → Allowed domains**, writing one domain per line (without `https://` or a path): for example `youragency.com`. If you paste a full URL, the platform automatically converts it to the domain when saving. > **Warning — With the list empty (the default), the widget works on any site.** > > As soon as you add at least one domain, the widget *only* connects from those domains and their > subdomains: `youragency.com` also covers `www.youragency.com` and `blog.youragency.com`, but > `www.youragency.com` does NOT cover `youragency.com` on its own. A similar-looking domain (e.g. > `other-youragency.com`) never matches. If the domain isn't authorized, the chat can't open a session with > the backend — this is a common cause of "the widget shows up but doesn't respond" (see chapter 5). Tip: register the root domain (`youragency.com`) to cover the `www` variant and your subdomains in one go; add any other domain where you also embed the snippet separately (for example, a staging environment). ## Widget customization The chat's look and greeting are configured in **Settings → Widget customization**: primary color, button position (bottom right or bottom left), welcome message, assistant name and avatar URL. Changes show up immediately in that same screen's preview; click "Save" to apply them to the public widget.