This is a graphical (browser) frontend for org-roam. org-roam-ui-open starts the server and opens the website in the browser. org-roam-ui-follow-mode enables follow mode, which causes the website to track the open node in Emacs. By default, tracking zooms to the node, but this can be changed in the website’s settings: Behavior > Follow Emacs by…

There is a command to sync the Emacs theme with the UI, but this completely breaks it for us.