Preview:
<html>
<head>
<title>teste de extensão</title>
  <style>
  .paratexto {
    background-color: #000000;
    border-radius: 12px;
    font-size: 28px;
    }
  </style>
  <style>
  .textoamarelo {
    color: #FFFF00;
    }
  </style>
  <style>
  body {
    background-color: #00FFFF;
    }
  </style>
</head>
<body>
<center>
 <div class= "para texto">
  <h1 class= "textoamarelo">este é um teste!</h1>
  </div>
</center>
</body>
</html>
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