ear-gradient(to top left, red, green);
      }
    </style>
  </head>
  <body>
    <div class="outer">
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
      <div class="inner"></div>
    </div>
    <div class="outer_gradient">
      <div class="inner_gradient"></div>
      <div class="inner_gradient"></