 height:600px; border: 1px solid black; border-spacing: 2px;">
    <div style="display: table-row; height:100%;">
      <div class="subproblem">
        <div style="padding-bottom: 1em;">Find the square of <div id="givenNum" class="CTATTextInput"></div>
        </div>
        <div id="sub-problem1" class="CTATGroupingComponent greybox">
          <table border="0">
            <tr>
              <td align="left">First part</td>
              <td width="20">&nbsp;</td>
              <td>
                <div