centering image

center-image.html

<div class="image-wrapper">
    <table class="iw">
        <tr>
            <td>
                <img src="images/products/dmx4308.gif" alt="4">
            </td>
        </tr>
    </table>
</div>

.slick-slide .iw {
   height:100%;
   width: 100%;
   margin: 0;
   padding: 0;
   border: 0;
}
.slick-slide img {
    display: initial;
}
.slick-slide .iw td {
   vertical-align: middle;
   text-align: center;
}