src/vs/workbench/contrib/webview/browser/baseWebviewElement.ts/BaseWebview/style
class BaseWebview:	protected style(): void {
		let { styles, activeTheme, themeLabel } = this.webviewThemeDataProvider.getWebviewThemeData();
		if (this.options.transformCssVariables) {
			styles = this.options.transformCssVariables(styles);
		}

		this._send('styles', { styles, activeTheme, themeName: themeLabel });
	}