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I made a report system that is displayed to make printing on A4 sheet. I put some edges on it to make printing. The problem is that at the time of printing, it prints everything black. The problem is the bootstrap, because when I take it all gets right.
Form
Note: The borders in the code below are #000 (black) but any color I put does not work
<div class="container" id="all-recibo" style="font-size:12pt;border:2px solid #000;border-radius:10px;margin-top:10px;padding-top:10px;">
    <div class="row" style="border-bottom:2px solid #000;margin-bottom:10px;">
        <div class="col-md-4" id="logo_recibo">
            <img src="<?php echo base_url('assets/images/content/'.$empresa->logo);?>" class="img-responsive">
        </div>
        <div class="col-md-8 text-center">
            <h3 style="color:#BB6B5A">Telefone: <?php echo $empresa->telefone;?></h3>
            <h4 style="color:#BB6B5A">Email: <?php echo $empresa->email;?></h4>
            <h4><?php echo $empresa->site;?></h4>
        </div>
    </div>
    <div class="row">
        <div class="col-md-3"> </div>
        <div class="col-md-5 text-center"><h1>Recibo</h1></div>
        <div class="col-md-3" style="border:2px solid #000;border-radius:10px;"><h3><strong>R$ <?php echo $recibo->valor;?></strong></h3></div>
        <div class="col-md-1"> </div>
    </div>
    <div class="row">
        <div class="col-md-11">Recebi do Sr. (a) <u><?php echo $recibo->cliente;?><?php echo str_repeat("  ", (313 - strlen($recibo->cliente)));?></u></div>
    </div>
    <br>
    <div class="row">
        <div class="col-md-11">A importância de <u><?php echo $recibo->extenso;?><?php echo str_repeat("  ", (317 - strlen($recibo->extenso)));?></u></div>
    </div>
    <br>
    <div class="row">
        <div class="col-md-11">Referente à <u><?php echo $recibo->servico;?><?php echo str_repeat("  ", (321 - strlen($recibo->servico)));?></u></div>
    </div>
    <br><br>
    <div class="row">
        <div class="col-md-6"> </div>
        <div class="col-md-3" id="data_recibo">Sorocaba, <u><?php echo date('d/m/Y');?></u></div>
        <div class="col-md-6">
            <div class="text-center">
            ____________________________________________
            <br>
            ASSINATURA
            </div>
        </div>
        <div class="col-md-3" id="condicoes_recibo">
            <p>Só aceitamos reclamações dentro de 48 horas</p>
        </div>
    </div>
</div>