JSFiddle - React, Tailwind, and code Playground

HTML

<table class="form_caja">
        <tr><th>Referidos</th></tr>

        <tr><td>Numero</td><td>Companhia</td><td>Nombre</td><td>Apellido</td><td>Email</td></tr>

            <tr><td>0976343344</td><td>PERSONAL</td><td>f</td><td>asd</td><td></td></tr>

            <tr><td>0992123123</td><td>CLARO</td><td>dA</td><td>de</td><td></td></tr>

            <tr><td>0963555457</td><td>CLARO</td><td>f</td><td>sdf</td><td></td></tr>

            <tr><td>0963555345</td><td>CLARO</td><td>e</td><td>de</td><td></td></tr>

    </table>

CSS

.form_caja {
    width: 524px;
    padding-top: 8px;
    padding-bottom: 15px;
    margin: 0 auto 20px auto;
    background: #446bb3;

     border-radius: 15px;

    -moz-border-radius: 15px;

    -webkit-border-radius: 15px;
    color: #446bb3;
}