<table class="st-62c73649">
    <style>
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            border: none;
            margin: 0 auto;
            padding: 0.25rem;
            border-collapse: separate;
            border-spacing: 0.85em 0.2em;
            line-height: 1.2em;
        }

        .st-62c73649 tr td {
            vertical-align: top;
            padding: 0;
            border: none;
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        .st-62c73649 br {
            line-height: 0em;
            margin: 0;
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        .st-62c73649 sub {
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    </style>
    <tr><td colspan="3" style="border-bottom: 1.5px solid black; padding: 0"></td></tr>
    <tr>
        <td style="font-weight:bold;text-align:left;">Group 1</td>
        <td style="text-align:center;"></td>
        <td style="font-weight:bold;text-align:center;">value1</td>
    </tr>
        <tr><td colspan="3" style="border-bottom:1px solid black;padding:0"></td></tr>    <tr>
        <td style="text-align:left;">a</td>
        <td style="font-weight:bold;text-align:left;">mean</td>
        <td style="text-align:center;">2.5</td>
    </tr>
    <tr>
        <td style="text-align:left;">b</td>
        <td style="font-weight:bold;text-align:left;">mean</td>
        <td style="text-align:center;">6.5</td>
    </tr>
    <tr><td colspan="3" style="border-bottom: 1.5px solid black; padding: 0"></td></tr>
</table>