.Feature-content- when changing background color, area around feature images stay white

I changed backround color in .feature-content to :

.feature-content {
margin-top:15px;
background:#C8C8C8;
padding:35px 0;
-webkit-box-shadow: 0px 0px 3px 2px rgba(0, 0, 0, 0.1);
-moz-box-shadow: 0px 0px 3px 2px rgba(0, 0, 0, 0.1);
box-shadow: 0px 0px 3px 2p x rgba(0, 0, 0, 0.1);
overflow:hidden;
}

Now, the area arond feature images stay white (See attached image). How can I fix it? Thanks.