Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Tabla TP-2-01</title>
<style id="jsbin-css">
#encabezado{
  font-weight: bold;
}

tr>td:first-child{
  color: blue;
}

tr>td:last-child{
  color: red;
}
</style>
</head>
<body>
  <table>
    <thead>
      <tr id="encabezado">
        <th>Nombre</th>
        <th>Email</th>
        <th>Categoria</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Norberto</td>
        <td>norberto@gmail.com</td>
        <td>admin</td>
      </tr>
      <tr>
        <td>Juana M</td>
        <td>juanac@gmail.com </td>
        <td>admin</td>
      </tr>
      <tr>
        <td>Alberto C</td>
        <td>alberto@yahoo.com</td>
        <td>user</td>
      </tr>
      <tr>
        <td>Anibal G</td>
        <td>anibal@hotmail.com</td>
        <td>supervisor</td>
      </tr>
    </tbody>
  </table>


<script id="jsbin-source-css" type="text/css">#encabezado{
  font-weight: bold;
}

tr>td:first-child{
  color: blue;
}

tr>td:last-child{
  color: red;
}</script>
</body>
</html>