# `PhoenixKitWeb.Components.ThemeBootstrap` [🔗](https://github.com/BeamLabEU/phoenix_kit/blob/v2.13.8/lib/phoenix_kit_web/components/theme_bootstrap.ex#L1) The pre-paint theme setup — palettes plus the stamp script — renders in ``, before (or with) the stylesheets. Every page class had its own first-paint story and most of them flashed: the dashboard's `` carried no `data-theme` and applied the saved one from a script at the end of ``; the standalone admin hardcoded `data-theme="light"` and fixed it up on DOMContentLoaded; the kit's own root layout hardcoded light and ran no theme JS at all. A dark-mode user got a white flash on the first two and permanent light on the third. This component is the one shared answer: the custom-theme `