input.html

<style>
    td {
        padding: 4px;
    }
    input {
        width: 100%;
        display: block;
        border: 1px inset #EEE;
        margin: -1px;
    }
</style>

<table width="100%">
    <tr>
        <td>
            <input/>
        </td>
        <td width="50">
            <button>edit</button>
        </td>
    </tr>
</table>