JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" id="block_open">Ссылка</a>
<div id="block"></div>

CSS

#block
{
    width: 200px;
    height: 20px;
    background: red;
}

JavaScript

$('#block_open').click(function(){
    if($('#block').height() == 20)
    {
        $('#block').animate({height: "150px"}, 'slow');
        $('#block').css("background", "yellow");
    }
    else
    {
        $('#block').animate({height: "20px"}, 'slow');
        $('#block').css("background", "red");
    }
});