This is the answer for your Android app:
Load your website URL(Home page) on WebView.
Open any page in the website on WebView, don't on local Browser.
If you press on backbutton will go to the before page, don't out of app.
But, in order to iOS, it seems that there is a lack of the native iOS functionality. Apple are still rejecting the app based on the 4.2.2 guidelines stating:
"We noticed that your app only includes links, images, or content aggregated from the Internet with limited or no native iOS functionality. We understand that this content may be curated from the web specifically for your users, but since it does not sufficiently differ from a mobile web browsing experience, it is not appropriate for the App Store."
In this regard, we've to make a minor incremental change at least in order to try and get this through with good luck. I think that way we could ensure your app is compliant with all sections of the App Store Review Guidelines and the Terms & Conditions of the Apple Developer Program
Below are a few tried and tested ideas to get your app approved:
Catalogue category - make your app look and feel more like a category and submit it under this category
Great user experience - offering a feature and content enabling people to do something, such as:
-enable push notification
-add camera
-send email option included
-make a call from the app
-display your social media channels
Editorial content - audio, photos etc
Let's discuss further