1. <!DOCTYPE html>
    2. <html lang="en">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    7.     <title>Document</title>
    8.     <style>
    9.         .out_container {
    10.             width: 100%;
    11.             height: 100%;
    12.             display: flex;
    13.         }
    15.         .left {
    16.             height: 500px;
    17.             width: 500px;
    18.             background-color: red;
    19.         }
    21.         .right {
    22.             height: 500px;
    23.             flex: 1;
    24.             background-color: green;
    25.         }
    26.     </style>
    27. </head>
    29. <body>
    30.     <div class="out_container">
    31.         <div class="left"></div>
    32.         <div class="right"></div>
    33.     </div>
    34. </body>
    36. </html>