Paraxial scroll down banner ad code Mobile devices

I am looking for an experienced developer to build a paraxial scroll down banner ad code for both iOS and Android mobile devices. We are unsure if the code will be used for services such as managed cloud hosting. The code must be designed to display in an aesthetically pleasing way on a variety of devices and platforms. The banner ad should be optimized for high visibility, user engagement and performance. The successful candidate will have strong experience building attractive and intuitive banner ad designs that are optimized for mobile. Experience with HTMLS, CSS, JavaScript and other web technologies is also desired for this project. The goal is to create a code that is easily readable, efficiently loadable and displays correctly on any mobile device or platform. The project must be completed quickly and accurately so that it can be launched promptly. ----------------------------------------------------- Hello, I need a script/html code to show paraxial banners (I don't know the exact name of this banner type) when you scroll on mobile devices. You know those that show an image in the middle when you scroll on a webpage. I need the following: 1) The code to show any banner image on my own website in that format on mobile devices. If you already have something more rich in feature let me know and send me a demo or sample so I can see how it looks like. Please let me know what image size in pixel is compatible for such banners on mobile. Info: 1) Automatic bids will be Ignored 2) Bid with irevelant prices will be Ignored/void. i.e. You bid $30 then you ask $100. Thanks