bootstrap image size

by lemon kazi

HTML

<div class="col-xs-6 col-md-4">
					<div class="thumbnail">
					<img src="http://www.it4gen.com/wp-content/uploads/2013/02/learnindoorgrowing.com_-460x345.png" class="img-responsive">
					    <a href="#" class="overlay"><div class="centered"><i class="fa fa-search"></i></div></a>
					</div>
    </div>
    
    <div class="col-xs-6 col-md-4">
					<div class="thumbnail">
					<img src="http://www.totalcableusa.com/images/choose-us.png">
					    <a href="#" class="overlay"><div class="centered"><i class="fa fa-search"></i></div></a>
					</div>
    </div>
        
        <div class="col-xs-6 col-md-4">
					<div class="thumbnail">
					<img src="http://www.totalcableusa.com/images/choose-us.png">
					    <a href="#" class="overlay"><div class="centered"><i class="fa fa-search"></i></div></a>
					</div>
	    </div>

CSS

.thumbnail{
	padding: 0px;
	border-radius: 0px;
	position: relative;
	border: 1px solid #222;
}


.thumbnail img{
    height: 347px;
}
.drzac{
	margin-top: 30px;
}

.overlay{
	display: block;
	transition: all 0.3s;
	-webkit-transition: all 0.3s;
	background-color: rgba(50, 200, 235, 0.5);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    font-size: 2em;
    text-align: center;
}