Witam serdecznie. Mam proste pytanie, jak usunąć te marginesy między obrazkami? Stosuję grid system bootstrapa.

kod html:
<section>
<div class="container">
<div class="row">
<center><h1 class="wow bounceInUp">galeria</h1></center>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="0.5s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="1s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="1.5s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="2s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="2.5s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
<div class="col-sm-4 nomargins wow fadeIn" data-wow-delay="3s">
<img src="http://www.placehold.it/450x250" class="img-responsive nomargins" id="d1">
<div id="d2">zawartosc</div>
</div>
</div>
</section>
(wow fadein to biblioteki odpowiadające za animacje, nie mają nic wspólnego z problemem)
css:
#d1
{
}
#d2
{
display: block;
position: absolute;
bottom: 0;
width: 100%;
height: 20px;
text-align: center;
color: #333;
opacity: 1;
background: rgba(0, 115, 255, 1);
-webkit-transition: all .35s;
-moz-transition: all .35s;
transition: all .35s;
display:none;
}
.nomargins {
margin-right: -15px; // Removes the right gap
margin-left: -15px; // Removes the left gap
}