chenzhiguang
/
smartCity


			
				
					
						
						
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							<!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>
    *{
      margin: 0;
      padding: 0;
    }
    html {
      background: no-repeat center center / cover;
    }
    html, body,.layout {
      width: 100%;
      height: 100%;
    }

    .layout {
      display: flex;
      flex-direction: column;
    }

    .top {
      flex: 0 0 70px;
    }

    .main {
      flex: 1;
      display: flex;
      height: 100%;
    }

    .left,
    .right {
      height: 100%;
    }

    .left { 
      width: 28%;
    }

    .right {
      width: 28%;
    }

    .middle {
      flex: 1;
      height: 100%;
      padding: 0 50px;
    }
  </style>
</head>
<body>
  <div class="layout">
    <!-- <iframe src="./header.html" frameborder="0" class="top"></iframe> -->
    <div class="main">
      <iframe src="./survey.html" frameborder="0" class="left"></iframe>
      <iframe src="./economics.html" frameborder="0" class="middle"></iframe>
      <iframe src="./security.html" frameborder="0" class="right"></iframe>
    </div>
  </div>
</body>
</html>