/*display flex*/
.display-flex {
    display: flex;
    display: -webkit-flex;
}

    .display-flex.row {
        flex-direction: column;
    }

        .display-flex.row .flex {
            flex-grow: 1;
        }

    .display-flex.center {
        align-items: center;
        justify-content: center;
    }

/*end display flex*/