<html>
<head>
  <title>test</title>
  <style>
    div {
      width: 1000px;
      height: 100px;
      background-color: #f00;
    }

    @media screen and (min-width: 1px) {
      div {
        width: 200px;
      }
    }
  </style>
</head>
<body>
<div></div>
</body>
</html>
