Default Styling
Address Finder's default styling works by injecting a style tag into the document head.
The default style can be found at https://cdn.jsdelivr.net/npm/@ideal-postcodes/address-finder/css/address-finder.css.
To prevent this, set injectStyle: false and load the stylesheet yourself - required under a strict Content Security Policy. See External Stylesheet.
Alternatively, assign a CSS stylesheet URL to injectStyle and the widget loads it as a <link> tag instead. E.g.
{
injectStyle: "https://cdn.jsdelivr.net/npm/@ideal-postcodes/address-finder@5/css/address-finder.min.css",
}