# Web SDK theming > Restyle the Runbear chat widget with --runbear-* CSS variables, turn on dark mode, and target its stable class and data hooks from your own CSS. Source: https://docs.runbear.io/api/web-sdk/theming Last updated: 2026-09-30 The widget ships its own stylesheet and keeps it to itself: every rule it emits is scoped to `[data-runbear]`, the attribute on the widget's own element. It declares nothing on your `:root` and doesn't restyle your application. You restyle the widget with CSS variables, and target its parts through stable class and data hooks. This page describes 0.3.0 and later. If you are upgrading from 0.2.x, see [Migrating from 0.2.x](#migrating-from-02x). > **Note** > > The stylesheet is injected as an inline `