How to fix it?
Please look at this picture and tell me what's wrong.
PS: All the image is 400*250, but the green one is 399*250.I think "img-responsive" class will fix it,but it doesn't work.
<body>
<div class="container">
<div class="row">
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\1.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\2.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\3.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\4.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\5.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\6.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\7.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\8.jpg" alt="">
</a>
</div>
<div class="col-md-4">
<a href="" class="thumbnail">
<img class="img-responsive" src="img\9.jpg" alt="">
</a>
</div>
</div>
</div>
</body>
</html>