body {
    text-align:center;
    background: tan; /* you can choose your own color */
}

.row{
    margin:0px 0px 0px 350px; 

}
.col-xs-3 {
    background: gray; /* you can choose your own color */
    margin: 5px;
    height:100px;
    width:100px;
    display:inline-block;
 background-size:cover;

}