.flex-images {
    overflow: hidden;
}

    .flex-images .item {
        float: left;
        margin: 10px;
        box-sizing: content-box;
        overflow: hidden;
        position: relative;
    }

        .flex-images .item img {
            display: block;
            width: auto;
            height: 100%;
            margin: 0px auto;
        }