prueba.html

<div style="background: lightcoral; position:relative; z-index:-1000;"> Lorem Ipsum is simply dummy text of the printing
    and
    typesetting industry.
    Lorem Ipsum has been the industry's standard
    dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
    specimen
    <div style="background: lightsalmon; position:relative; z-index:200;">book. It has survived not only five
        centuries,
        but also the leap into electronic typesetting, remaining essentially
        unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages,
        and
        more
        recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</div>
</div>
<div style="background: lightsteelblue; position:absolute; z-index:2; left:60px; top: 3em;">Lorem Ipsum is simply dummy
    text of the printing and
    typesetting industry. Lorem Ipsum has been the industry's standard
    dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
    specimen
    book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially
    unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and
    more
    recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</div>
<div style="background: lightgreen; position:absolute; z-index:-100; left:10em; top:25px; opacity:0.5">Lorem Ipsum is
    simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard
    dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type
    specimen
    book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially
    unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and
    more
    recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</div>