I can not understand why the Customers label is larger than the Order label, with 2 being defined with the same size.
<div id="accordion-opcoes">
<div class="panel box">
<div class="box-header with-border">
<h4 class="box-title">
<a data-toggle="collapse" data-parent="#accordion-opcoes" href="#opcoes-avancadas" aria-expanded="false" class="collapsed">
!!Opções avançadas!!
</a>
</h4>
</div>
<div id="opcoes-avancadas" class="panel-collapse collapse" aria-expanded="false">
<div class="box-body">
<div class="col-xs-12">
<div class="form-group col-xs-12 col-sm-6">
<label for="ord_prj" class="col-sm-3 control-label">!!Ordem!!</label>
<div class="col-sm-9">
<select name="ord_prj" class="form-control">
</select>
</div>
</div>
<div class="form-group col-xs-12 col-sm-6">
<label for="sig_prj" class="col-sm-3 control-label">!!Sigla!!</label>
<div class="col-sm-9">
<input type="text" id="sig_prj" name="sig_prj" maxlength="24" class="form-control" placeholder="!!Sigla!!">
</div>
</div>
</div>
<div class="col-xs-12">
<div class="form-group col-xs-12 col-sm-12">
<label for="cli_prj" class="col-sm-3 control-label">!!Clientes!!</label>
<div class="col-sm-9">
<select name="cli_prj" class="form-control">
</select>
</div>
</div>
</div>
</div>
</div>
The idea is to align the Customer combo with the top line.