I'm using bootstrap grid as shown below and I'm trying to centralize some divs. ( pic). I've tried everything {margin:0 auto; width:50% } etc etc but I can't work it out. It can't be that difficult to centralize some divs. What's the problem here? Please don't mark it as a duplicate. I've been researching the whole day, I just can't work it out. Thank you
<header data-spy="affix" id="myHeader" class="container row">
            <div class="col-sm-4 ">
                <div class="centralize">
                        <a href="http://www.facebook.com" target="_blank">
                        <img class="logos" src="images/facebook.png" onmouseover="zoomin(this.id)" onmouseout="zoomout(this.id)">
                        </a>    
                        <a href="http://www.twitter.com" target="_blank">
                        <img class="logos" src="images/twitter.png" onmouseover="zoomin(this.id)" onmouseout="zoomout(this.id)">
                        </a>    
                        <a href="http://www.instagram.com" target="_blank">
                        <img class="logos" src="images/instagram.png" onmouseover="zoomin(this.id)" onmouseout="zoomout(this.id)">
                        </a>
                </div>
            </div>  
            <div class="col-sm-4">
                <div class="centralize">
                        //Other Stuff to be centralized 
                </div>
            </div>                  
            <div class="col-sm-4">
                <div class="centralize">
                        //Other Stuff to be centralized 
                </div>
            </div>          
    </header>
 
    