JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>
            <div class="unselected">1</div>
        </td>
        <td>
            <div class="unselected">2</div>
        </td>
        <td>
            <div class="unselected">3</div>
        </td>
    </tr>
    <tr>
        <td>
            <div class="unselected">4</div>
        </td>
        <td>
            <div class="unselected">5</div>
        </td>
        <td>
            <div class="unselected">6</div>
        </td>
    </tr>
    <tr>
        <td>
            <div class="unselected">7</div>
        </td>
        <td>
            <div class="unselected">8</div>
        </td>
        <td>
            <div class="unselected">9</div>
        </td>
    </tr>
</table>

CSS

table {
    border:1px solid black;
    border-collapse: collapse;
    border-spacing: 0px;
    width: 100px;
}
td {
    text-align: center;
    border:1px solid black;
    padding: 0;
}
.unselected {
    background-color: yellow;
}
.selected {
    border-color: red;
    border-width: 2px;
    border-style: solid;
}
div {
    box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
    cursor: pointer;
    padding: 3px;
}

JavaScript

$(function () {

    $("div").click(function () {
        if ($(this).hasClass("unselected")) {
            $(this).removeClass("unselected")
                .addClass("selected");
        } else {
            $(this).removeClass("selected")
                .addClass("unselected");
        }
    });

});