Untitled

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <style>
    body {
      margin: 0;
      height: 100vh;
      width: 100vw;
      display: flex;
      justify-content: center;
      align-items: stretch;
      flex-direction: row;
    }
    .container {
      flex: 1;
      display: flex;
      align-items: stretch;
      flex-direction: row;
    }
    .content-bg {
      flex: 0.65;
      background: green;
      display: flex;
      justify-content: flex-end;
      align-items: center;
    }
    .right-bg {
      flex: 0.35;
      background: blue;
      display: flex;
      justify-content: flex-start;
      align-items: center;
    }
    .content {
      flex: 1;
      position: relative;
      padding: 20px;
      max-width: 832px;
      height: 500px;
    }
    .right {
      flex: 1;
      position: relative;
      padding: 20px;
      max-width: 448px;
      height: 500px;
    }
  </style>
</head>
<body>
  <div class='content-bg'>
    <div class='content'>
      <h2>content</h2>
    </div>
  </div>
  <div class='right-bg'>
    <div class='right'>
      <h2>right</h2>
    </div>
  </div>
</body>
</html>