<!DOCTYPE html>
<html lang="en">
<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>Flexbox</title>
  </head>
<body>
   <div class="container">
    <div class="item" id="one">1</div>
    <div class="item" id="two">2</div>
    <div class="item" id="flex">3</div>
   </div>
</body>
</html>
.container{
            display:flex;
            height:500px;
            border:1px solid #808080;
         }

.item {
      border:1px solid #1d1d1d;
      background-color:#23C4ED;
      width:50px;
      height:50px;
      margin:7px;
   }

External CSS

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External JavaScript

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