How to overlay one div over another div

Question

I need assistance with overlaying one individual div over another individual div.

My code looks like this:

Answer 1

#container {
  width: 100px;
  height: 100px;
  position: relative;
}
#navi,
#infoi {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
#infoi {
  z-index: 10;
}

  
a
  

    b
  

I would suggest learning about position: relative and child elements with position: absolute.