I'm very beginner with bootstrap. So I ask: is it possible to center the boxes that are inside the div, like the image below?

My html
      <!-- Clientes -->
   <section id="clientes">
       <div class="container">
           <div class="row">
               <div class="section-title text-center wow fadeInUp">
                   <h2>Quem está usando</h2>
                   <p>O SIOM cabe no seu mercado. Tecnologia, Varejo, Cidades...</p>
               </div>
               <div class="linha">
                   <div class="col-md-3 col-sm-6 col-xs-12" style="background-color:white;padding:0px 0px 0px 0px;">
                       <div class="pricing-table text-center">
                           <div class="price">
                               <img src="img/clients/clientes-ingram.png" alt="Ingram" style="text:center;">
                           </div>
                       </div>
                   </div>
                   <div class="col-md-3 col-sm-6 col-xs-12" style="background-color:white;padding:0px 0px 0px 0px;">
                       <div class="pricing-table text-center">
                           <div class="price">
                               <img src="img/clients/clientes-parque.png" alt="Parque da Cidade de Brasília" width="120px" height="100px" style="text:center;">
                           </div>
                       </div>
                   </div>
               </div>
           </div>
       </div>
   </section>
I do not know if the best practice is to centralize by css. I tried in the bootstrap, but when I make the change I spoiling other parts of the page.
 
     
    