<!-- https://opentutorials.org/module/2367/13464 의 예제 -->
<div id="parent">
  <div id="child">
    Hello world
  </div>
</div>
#parent{
  /*border:1px solid tomato;*/
  margin-top:100px;
}
#child{
  background-color: powderblue;
  margin-top:50px;
}
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