<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="col-md-4">Nome</div> <div class="col-md-2">Condição</div> <div class="col-md-4">Valor</div> </div> <div class="row"> <div class="col-md-4">Código</div> <div class="col-md-2 condicao"> <select class="select"> <option>=</option> <option>Diferente</option> <option>></option> <option><</option> <option><=</option> <option>>=</option> </select> </div> <div class="col-md-4"><input type="text"></div> </div> <div class="row"> <div class="col-md-4">Código</div> <div class="col-md-2 condicao"> <select> <option>=</option> <option>Diferente</option> <option>></option> <option><</option> <option><=</option> <option>>=</option> </select> </div> <div class="col-md-4"><input type="text"></div> </div> </div>

.condicao{ border:1px solid black; padding: 0; margin: 0; } .condicao .select { border:1px solid black; width:100%; }