Media carousel in mobile view - css

Question

I have this code that will display image carousel.
For desktops, I want to display 3 thumbnails per row;
For mobiles, just one or two thumbnail per row horizontally.
The code in working fine in desktopview but in mobileview how do i display in horizontally with only one or two image and use the indicator to see next image ?
i tried using this..but is not working
<div class="col-sm-6 col-md-4">
html
<div class="container">
<div class="row">
<h2>Media Slider Carousel BS3</h2>
</div>
<div class='row'>
<div class='col-md-8'>
<div class="carousel slide media-carousel" id="media">
<div class="carousel-inner">
<div class="item active">
<div class="row">
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
</div>
</div>
<div class="item">
<div class="row">
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
</div>
</div>
<div class="item">
<div class="row">
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
<div class="col-md-4">
<a class="thumbnail" href="#"><img alt="" src="http://placehold.it/150x150"></a>
</div>
</div>
</div>
</div>
<a data-slide="prev" href="#media" class="left carousel-control">‹</a>
<a data-slide="next" href="#media" class="right carousel-control">›</a>
</div>
</div>
</div>
</div>
CSS
/* carousel */
.media-carousel
{
margin-bottom: 0;
padding: 0 40px 30px 40px;
margin-top: 30px;
}
/* Previous button */
.media-carousel .carousel-control.left
{
left: -12px;
background-image: none;
background: none repeat scroll 0 0 #222222;
border: 4px solid #FFFFFF;
border-radius: 23px 23px 23px 23px;
height: 40px;
width : 40px;
margin-top: 30px
}
/* Next button */
.media-carousel .carousel-control.right
{
right: -12px !important;
background-image: none;
background: none repeat scroll 0 0 #222222;
border: 4px solid #FFFFFF;
border-radius: 23px 23px 23px 23px;
height: 40px;
width : 40px;
margin-top: 30px
}
/* Changes the position of the indicators */
.media-carousel .carousel-indicators
{
right: 50%;
top: auto;
bottom: 0px;
margin-right: -19px;
}
/* Changes the colour of the indicators */
.media-carousel .carousel-indicators li
{
background: #c0c0c0;
}
.media-carousel .carousel-indicators .active
{
background: #333333;
}
.media-carousel img
{
width: 250px;
height: 100px
}
/* End carousel */
js
$(document).ready(function() {
$('#media').carousel({
pause: true,
interval: false,
});
});