Mini Shell

<style type="text/css">
    #contato{background: #f1f1f1;}
    #contato h1{color:<?php echo $cor1 ?>; margin-bottom: 30px; font-weight: 800; text-transform: uppercase;}
    #contato .form-control{height: 60px; border-radius: 5px; box-shadow: rgba(149, 157, 165, 0.1) 0px 8px 100px;}
    #contato textarea{height: 120px !important; padding-top: 15px;}
    #contato input::placeholder{color: <?php echo $cor1 ?> !important; font-weight: 500; font-size: 15px;}
    #contato textarea::placeholder{color: <?php echo $cor1 ?> !important; font-weight: 500; font-size: 15px;}
</style>
<section id="contato" class="text-center">
    <center>
        <h1>Contato</h1>
    </center>
    <div class="clear10"></div>
    <form id="enviar_contato" name="enviar_contato" enctype="multipart/form-data" role="form" class="form" method="post">
        <input name="data" type="hidden" value="<?php echo date("Y-m-d H:i:s"); ?>" />
        <div class="container">
            <div class="row">
                <div class="col-sm-6">
                    <input required="required" class="form-control" name="nome" placeholder="Nome:" type="text" maxlength="100"/>
                </div>
                <div class="col-sm-6">
                    <input required="required" class="form-control" name="email" placeholder="E-mail:" type="email" maxlength="100"/>
                </div>
                <div class="col-sm-4">
                    <input required="required" class="form-control phone" name="telefone" placeholder="Telefone:" type="text" maxlength="15"/>
                </div>
                <div class="col-sm-4">
                    <input class="form-control phone" name="whatsapp" placeholder="Whatsapp:" type="text" maxlength="15"/>
                </div>
                <div class="col-sm-4">
                    <input required="required" class="form-control" name="cidade" placeholder="Cidade:" type="text" maxlength="100"/>
                </div>
            </div>
            <input required="required" class="form-control" name="assunto" placeholder="Assunto:" type="text" maxlength="100"/>
            <textarea class="form-control" placeholder="Mensagem:" name="mensagem"></textarea>
            <center><div class="g-recaptcha" data-sitekey="<?php echo $row_configuracoes['configuracoes_site_key'] ?>"></div></center>
            <div class="clear20"></div>
            <button type="submit" class="btn btn-padrao transition">Enviar formulário</button>
        </div>
    </form>
    <div class="clear60 hidden-xs"></div>
</section>
<div id="retorno"></div>