JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td class='one'>One</td>
        <td class='two'>Two</td>
    </tr>
    <tr>
        <td colspan="2" class='three'>Three</td>
    </tr>
</table>

CSS

body {
 font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
 padding: 100px;
 background: pink;
}

table {
/* basic */ 
 background-color: #fff;
 margin: 0 auto;
 width: 200px;
 padding: 100px;
 text-align: center;
/* border-radius */
 border-radius: 20px;
/* box-shadow */
 box-shadow: rgba(0,0,0,0.8) 0 0 10px;
 border-collapse: collapse;
}

table td{
  color: white;
}

td.one{
    border-radius: 20px 0 0 0;
    background-color: black;
}
td.two{
    border-radius: 0 20px 0 0;
    background-color: darkgreen;
}
td.three{
    border-radius: 0 0 20px 20px;
    background-color: darkred;
}