By default you cannot get custom CSS/Javascript loaded into Android Webview. We should override the onPageFinished method to be able to add custom CSS/javascript to Android Webview. This example is using Kotlin, you may search something else if you're using native Java code or Flutter. The best approach to use Custom CSS/Javascript is by creating the style node containing CSS and a script node containing the javascript for your sites. var node = document.createElement('style'); node.type = 'text/css'; node.innerHTML = 'MY_CSS_STYLE'; document.head.appendChild(node); and var node = document.createElement('script'); node.type = 'text/javascript'; node.innerHTML = 'MY_JS_SCRIPT'; document.body.appendChild(node); and override the onPageFinished method: override fun onPageFinished(view: WebView, url: String) { val code = """javascript:(function() { var node = document.createElement('style');
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