<!-- https://opentutorials.org/module/2367/13414 의 예제 -->
<div id="other">other</div>
<div id="grand">
  grand
  <div id="parent">
    parent
    <div id="me">me</div>
  </div>
</div>
#parent, #other, #grand{
  border:5px solid tomato;
}
#grand{
  position: relative;
}
#me{
  background-color: black;
  color:white;
  position: absolute;
  left:0;
  top:0;
}
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