.obm {
    overflow: hidden;
}

@media only screen and (min-width: 501px) {
    .obm div {
        float: left;
        width: 49%;
        margin-right: 1%;
        margin-bottom: 15px;
    }
}

@media only screen and (max-width: 500px) {
    .bm, .list-group {
        text-align: center;
    }

    .bmimage img {
        display: block;
        margin-right: auto;
        margin-left: auto;
    }
}