JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content" id="div3.1">Палка 3.1</div>
        <div class="content" id="div3.2">Палка 3.2</div>
        <div class="content" id="div3.3">Палка 3.3</div>

CSS

.content {
                width: 100%;
                background-color: lightgrey;
                height: 100px;
            }

JavaScript

$(".content").click(function() {
                alert(this.id);
                $(".content").css("background-color", "");
                $(this).css("background-color", "red");
            });