Build a website

Need to develop a simple website on the lines as shown below Dynamic product gallery that changes based on color variant selected Product image Title Review Stars should change as reviews are added Price of the product Divider Size Drop down menu that shows all other sizes available. These sizes should redirect to another product page for their size listing Color Swatches to let customers choose their color. These variants should dictate the product image shown and image shown in section 12 Description section. Should show 150 char and option to view more Add to Cart button. Should have functionality to change Copy and color and style Icon bar. This should be just above the fold Text + Image. This image should change based on color and size variant selected. I.e iPhone 7 blue will show a different pic than iPhone 7 Black Image + text can be static here Text + image static Return to Top button should anchor to header Review section Return to Top button should Anchor to header Footer Extra features: Return to top button should appear if user is scrolling on mobile Can apps still integrate with this page like the add to cart app that appears when user scrolls below add to cart button?