f; opacity: 0.8; border: 6px solid green; z-index: 2; padding: 3em; top: 6em; left: 6em; width: 6em;">
    z-index: 2, order: 2
    </div>
    
    <div style="background: #fff; opacity: 0.8; border: 6px solid blue; z-index: 1; padding: 3em; top: 1em; left: 4em; width: 6em;">
    z-index: 1, order: 3
    </div>
    
    <div style="background: #fff; opacity: 0.8; border: 6px solid red; z-index: auto; padding: 3em; top: 23em; left: 2em; width: 6em;">
    z-index: auto, order: 1
    </div>
    
    <div style