Estilo en tabla que viene de excel a gmail

Hey @mively
Avoid using ID selectors like #table2, because Create HTML Content doesn’t assign IDs by default. Use element selectors (table, td, th) instead.
Here’s example:

<html>
<head>
  <style>
    table {
        border-collapse: collapse;
        width: 100%;
        font-family: Arial, sans-serif;
    }

    th {
        background-color: #e0e0e0;
        border: 1px solid #000;
        padding: 8px;
        text-align: center;
    }

    td {
        border: 1px solid #000;
        padding: 8px;
        text-align: right;
    }

    tr:last-child {
        font-weight: bold;
        background-color: #e0e0e0;
    }

    tr:last-child td {
        border-top: 3px solid orange;
    }
  </style>
</head>
<body>
  <h3>Resumen Cartera de Clientes</h3>
  <table>
    <tr>
      <th>Descripción</th>
      <th>Monto</th>
    </tr>
    <tr>
      <td style="text-align:left;">Por Vencer</td>
      <td>3.971.562.551</td>
    </tr>
    <tr>
      <td style="text-align:left;">Vencidos</td>
      <td>1.686.189.463</td>
    </tr>
    <tr>
      <td style="text-align:left;">Facturas Rechazadas</td>
      <td>20.902.862</td>
    </tr>
    <tr>
      <td style="text-align:left;">Guias por Facturar</td>
      <td>1.162.516.107</td>
    </tr>
    <tr>
      <td style="text-align:left;">Total General</td>
      <td>6.841.170.983</td>
    </tr>
  </table>
</body>
</html>