How do I position one image on top of another in HTML?

Question

I\'m a beginner at rails programming, attempting to show many images on a page. Some images are to lay on top of others. To make it simple, say I want a blue square, with

Answer 1

The easy way to do it is to use background-image then just put an in that element.

The other way to do is using css layers. There is a ton a resources available to help you with this, just search for css layers.