JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>15</td>
        <td></td>
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        <td></td>
        <td></td>
    </tr>
    <tr>
        <td>14</td>
        <td></td>
        <td></td>
        <td></td>
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        <td></td>
        <td></td>
    </tr>
    <tr>
        <td>13</td>
        <td></td>
        <td></td>
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        <td></td>
        <td></td>
    </tr>
    <tr>
        <td>12</td>
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        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td>11</td>
        <td></td>
        <td></td>
        <td></td>
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    </tr>
    <tr>
        <td>10</td>
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        <td></td>
    </tr>
    <tr>
       ...

CSS

table {
    border-collapse: collapse;
}
td {
    width: 20px;
    height: 20px;
    border: 1px solid #000;
    border-collapse: collapse;
    margin:0;
    padding:0;
}
td:nth-child(-2n+2) {
    border: none;
    text-align: right;
    background-color: yellow;
}
tr:last-child td{
    border: none;
    text-align: center;
}
tr:nth-child(16) td {
    border: none;
}