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I created an HTML code to send information to the company’s clients where I work, when I send the email to the accounts *@hotmail.com or for their professional accounts *empresa.com.br everything is displayed correctly, but when sent to an account *@gmail.com the body of the email with the HTML code is never displayed. My code looks like this:
<html>
<head>
    <meta charset="utf-8"/>
    <title>Teste Email</title>
    <style>
        hr {
            border: 0; height: 1px; 
            background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0));
        }
        table 
        {
            font-family: arial, sans-serif;border-collapse: collapse;
            width:100%;
        }
        th, td 
        {
            border: 1px solid #dddddd;
            padding: 3px;
        }
        tr:nth-child(even) 
        {
            background-color: #dddddd;
        }
    </style> 
</head>
    <body>
        <a href="http://www.hss.com.br/" target="_blank">
            <img alt="Logo HSS Informática" title="Logo HSS informática" style="margin-left:5%; float:left"  src="http://www.hss.com.br/images/logo_oficial.png"></img>
        </a>
        <div style="margin-left:15%;margin-right:15%;text-align:center; margin-top:1%">
            <p style="font-size:30px;font-family:Verdana"><b><I>INFORMATIVO DE SUPRIMENTOS</I></b></p>
        </div>
        <div style="background-color:#4682B4;text-align:center;height:55px;margin-left:5%;margin-right:5%;margin-top:5px">
            <p style="font-size:25px; color:white; font-family:Verdana;height:7px"><B>NOME CLIENTE</B></p>
            <p style="font-size:15px; color:white; font-family:Verdana;">Dados cliente</p>
        <table>
            <tr>
                <th width="33%">PEDIDO: <i>Nº PEDIDO</i></th>
                <th width="33%">SUPRIMENTOS SOLICITADOS</th>
                <th width="33%">PREVISÃO DE ENTREGA: <i>dd/MM/yyyy</i></th>
            </tr>
        </table>
        <table>
            <tr>
                <th width="33%" align="center">Suprimento</th>
                <th width="33%" align="center">Quantidade</th>
                <th width="33%" align="center">Impressoras compatíveis</th>
            </tr>
            <tr>
                <td align="center">Modelo 01</td>
                <td align="center">01</td>
                <td align="center">MX511</td>
            </tr>
            <tr>
                <td align="center">Modelo 02</td>
                <td align="center">02</td>
                <td align="center">MX611</td>
            </tr>
            <tr>
                <td align="center">Modelo 03</td>
                <td align="center">03</td>
                <td align="center">MX611</td>
            </tr>
        </table>
        <br>
        <hr>
        <div style="background-color:#4682B4;text-align:center;height:25px;">
            <p style="font-size:18px; color:white; font-family:Verdana;height:7px">SUPRIMENTOS AGUARDANDO RETORNO</p>
        <br>
        <table>
            <tr>
                <th width="50%">Modelo de Suprimento</th>
                <th width="50%">Quantidade</th>
            </tr>
            <tr>
                <td align="center">Modelo 03</td>
                <td align="center">05</td>
            </tr>
            <tr>
                <td align="center">Modelo 04</td>
                <td align="center">04</td>
            </tr>
        </table>
        <br>
        <hr>
        <p style="text-align:center; font-family:Verdana; font-size:12px;">Esse <b>email foi enviado automaticamente</b> pelo sistema,<b> não é necessário respondê-lo.</b><br> Em caso de dúvidas responda este email ou entre em contato pelo telefone <b><i>(51)3594-7561</i></b>.</p>
        <div style="background-color:#4682B4;text-align:center;height:22px;">
            <p style="font-size:15px; color:white; font-family:Verdana;height:7px">HSS Assessoria em Informática - Rua 25 de Julho, 917 - Rio Branco - Novo Hamburgo / RS</p>
        </div>
        </div>
        </div>
    </body>
</html> 
If you have any tips

Possible duplicate of What is the best practice of styling an Email body?
– Leonardo Bonetti