table.foo {
        color: #000000;
        width: 100%;
        border: 1px solid #ccccee;
        margin: 20px 0px 0px 0px;
}

thead.foo  tr{
        background-color: #808080;
        color: #000000;
}

thead.foo th {
        font-size: 20px;
        padding: 0px;
        margin: 0px;
}

div.foo {
        border: 1px solid #000000;
        padding: 0px 0px 0px 0px;
        margin: 0px 0px 0px 0px;
        display: inline;
        height: 0%;
}

div.foo img {
        padding: 0px 0px 0px 0px;
        margin: 0px 0px 0px 0px;
}



        <table>
        <thead>
                <tr>
                        <th><div class="foo"><img src="a"><img src="b"><img src="c"></div></th>
                        <th>bar/th><th>sdfsdf</th>


                </tr>
        </thead><tr>
                        <td colspan="3">dfgfd</td>
                </tr>

        </table>