Spacing increases when breaking page with Dompdf

Question

Hello! I created a contract with Dompdf more when breaking the page is increased the space always in the first page information and so on, I have made several modifications to my code and I could not take that space. I would like the help of someone with discerning eyes to see the code.

Follows

<style>
    body{
        font-family: "Georgia" !important;
        font-size: 16px;
        color: #000;
        height: 100%;
    }

    .capa{padding:5px; }
    .page_break{ page-break-before: always; }
    @page { margin: 100px 25px 100px; }
    p { margin: 0px; }

    #header {
        position: fixed;
        text-align: center;
        margin-top: -70px;
        width: 100%;
    }
</style>

$lista = '';
    // CONSULTA PARA BUSCAR AS CLÁUSULAS
    $sql2 = "SELECT c.*, cl.* FROM contratos c, clausula cl WHERE c.id = cl.idContrato AND c.id = ".$_GET['id']." order by cl.ordem";
    $resul2 = mysql_query($sql2, $this->conexaoMysql());

    while ($resp2 = mysql_fetch_array($resul2)) {
        // CONSULTA PARA BUSCAR OS ITENS DO CONTRATO
        $sql3 = "SELECT i.* FROM clausula cl, itens_contrato i WHERE cl.id = i.idClausula AND i.idClausula = ".$resp2['id']." ORDER BY ordem ASC, ordenar ASC";
        $resul3 = mysql_query($sql3, $this->conexaoMysql());

        $lista.=utf8_decode('
        <table width="90%" border="1" cellpadding="2" cellspacing="0" align="center">
            <tr>
                <td colspan="2" style="text-transform: uppercase;"><b>'.$resp2['ordem'].'. '.utf8_decode($resp2['nome_clausula']).'</b>
                <hr>
                </td>
            </tr>');
            while($resp3 = mysql_fetch_array($resul3)){
                $lista.='<tr>
                    <td width="50px;" valign="top"><b>'.$resp2['ordem'].'.'.$resp3['ordenar'].'.</b></td>
                    <td text-align="justify">'.utf8_decode($this->palavraReservada($resp3['descricao'])).'</td>
                </tr>';
            }
        $lista.='</table>';
    }

I left it edged so I could illustrate it better.

Remembering that I based myself here.

Thanks in advance for your attention