<!DOCTYPE html>
<html lang="ko">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>마진 겹침 현상</title>
   
</head>

<body>
    <div class="parent">
        <div class="child"> Section #1     </div>
       <div class="child"> 
      Section #2</div>
<div class="child"> 
      Section #3</div>
    


</body>

</html>
 body {
  
            background-color: pink;
        }
       .child {
          border: 1px solid black;
           margin: 20px;
            padding: 20px;
         
          
            background-color: whitesmoke;
        }
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