> ## Documentation Index > Fetch the complete documentation index at: https://funnelfox.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Funnel-wide custom code > Add custom CSS, meta tags, and scripts that apply to every screen in your funnel. Funnel-wide custom code lets you inject styles, meta tags, and scripts without placing code on individual screen elements. Custom code is not reviewed or controlled by FunnelFox. Make sure anything you add is reliable and thoroughly tested before using it in production. ## How it works Click the **Editor menu** at the top left and select **Custom code** to open a full-screen code editor. Everything you write here is injected into the `` tag on every screen of your funnel. You can use ` ``` ## Next steps * Add [per-screen custom code](/editor/coding) with the Fox API and Raw HTML elements