Develope a single / simple webpage for testing connectivity

I need someone to create a single, simple .NET HTML5 page that can test the user's connectivity to the page / site. The file must: - be modern, minimalist, aesthetically pleasing - have a single button on the page that says "Test" - Download a 5kbyte stream from the server and then upload it again - Report "OK" if the test is successful - Report "FAILED" if the test is unsuccessful This simple page is designed to simply test that the user has access to the website hosting the file and confirm connectivity. This file must not timeout / error if the site is offline or the get / post fails and so should work offline / out of the user's cache on both pc and mobile devices.