flex-flex

by rootjang

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    #container {
      width: 500px;
      height: 300px;
      display: flex;
      margin: 0 auto 20px;
      align-items: center;
      border: 2px solid black;
    }

    #container div {
      width: 100px;
      height: 50px;
      border: 2px solid black;
      background: #ccc;
    }

    #box1 {
      -ms-flex: 1 1 0;
      -webkit-flex: 1 1 0;
      flex: 1 1 0;
    }

    #box2 {
      -ms-flex: 2 2 0;
      -webkit-flex: 2 2 0;
      flex: 2 2 0;
    }

    h1 {
      text-align:center;
    }

		p {
			font-weight:bold;
			text-align:center;
			font-weight:bold;
		}
  </style>
</head>
<body>
  <div id="container">
    <div id="box1"><p>1</p></div>
    <div id="box2"><p>2</p></div>
    <div id="box3"><p>3</p></div>
  </div>
</body>
</html>