#test01{
        background: #7FFF00;
      }
      #test02{
        background: #00FFFF;
      }
      #test03{
        background: #4169E1;
      }
      #test{
        background: #ff0000;
        height: 200px;
        width: 200px;
        display: flex;
        justify-content: space-between;
      }
    </style>
  </head>
  <body>
    <p>Test passes if:<br>
    1. the rectangle 1, 2, 3 show up in a row in a red rectangle.<br>
    2. No gap between the left edge of red rectangle and the left of rectan