JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>marges entre tbody&nbsp;: un test</title>
</head>
<body>

<table>
    <tbody>
        <tr>
            <td>test</td>
            <td>hopla</td>
            <td>schnapsum</td>
        </tr>
        <tr>
            <td>europa</td>
            <td>stork</td>
            <td>longdesc</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>schnapsum</td>
            <td>test</td>
            <td>stork</td>
        </tr>
        <tr>
            <td>hopla</td>
            <td>europa</td>
            <td>longdesc</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>test</td>
            <td>schnapsum</td>
            <td>europa</td>
        </tr>
        <tr>
            <td>stork</td>
            <td>longdesc</td>
            <td>hopla</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>europa</td>
            <td>stork</td>
            <td>hopla</td>
        </tr>
        <tr>
            <td>longdesc</td>
            <td>test</td>
            <td>schnapsum</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>hopla</td>
            <td>longdesc</td>
            <td>schnapsum</td>
        </tr>
        <tr>
            <td>test</td>
            <td>stork</td>
            <td>europa</td>
        </tr>
    </tbody>
</table>

    
</body>
</html>

CSS

table {
     position: relative;
     border-collapse: collapse;
 }
 
 tbody,
 tbody + tbody + tbody {
     position:relative;
     left: 0;
     display: block;
     width: 100%;
     background: lightblue;
     color: black;
     border-left: none;
 }
 tbody + tbody + tbody {
     top: 20px;
 }
 
 tbody + tbody {
     position:relative;
     top: 10px;
     background-color: yellow;
     border-left: 40px solid hsl(240, 80%, 40%);
     background: -moz-linear-gradient(left, hsl(240, 80%, 40%), hsl(0, 80%, 30%));
     color: white;
 }
 
 td,
 tbody+tbody+tbody td {
     width: 32.2%;
     padding: 4px 6px;
     border: 1px solid #444;
 }
 
 tbody + tbody td {
     border: 2px dashed white;
 }