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HTML

<!DOCTYPE html>
<html>
<head>
<title>Margin border</title>
<style type="text/css">
body {
    /* line-height: 38px; */
    font-size: 32px;
}

#panel1 {
    background: #00a000;
    float: left;
}

#panel2 {
    background: orange;
    float: left;
}

#panel1 p span {
    font-size: 14px;
}
</style>
</head>
<body>

    <div id="panel1">
        <p>Foo <span>Bar</span></p>
    </div>

    <div id="panel2">
        <p>Foo <span>Bar</span></p>
    </div>

</body>
</html>

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JSFiddle - React, Tailwind, and code Playground

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Use pre-released features

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Console