JSFiddle - React, Tailwind, and code Playground

HTML

<div id="panel">
    <div id="panel-content">Форма логина и пароля.</div>
    <div id="panel-sticker"> <span>Регистрация</span>

    </div>
</div>

CSS

#panel {
    position: fixed;
    top: -108px;
    left: 340px;
}
#panel-content {
    width: 145px;
    height: 85px;
    padding: 23px 5px 0px 5px;
    background: #AAA;
    text-align: center;
}
#panel-sticker {
    width: 145px;
    padding: 3px 5px;
    text-align: center;
    border-top: none !important;
    border-top-left-radius: 0px;
    border-top-right-radius: 0px;
    border-bottom-right-radius: 10px;
    border-bottom-left-radius: 10px;
    background: #AAA;
    cursor: pointer;
}
#panel-sticker span {
    display: block;
    width: 135px;
    margin: 0 auto;
    color: #FFF;
}

JavaScript

(function ($) {
    $(document).ready(function () {
        var $panel = $('#panel');
        if ($panel.length) {
            var $sticker = $panel.children('#panel-sticker');
            var showPanel = function () {
                $panel.animate({
                    top: '+=107',
                }, 300, function () {
                    $(this).addClass('visible');
                });
            };
            var hidePanel = function () {
                $panel.animate({
                    top: '-=107',
                }, 500, function () {
                    $(this).removeClass('visible');

                });
            };
            $sticker.children('span').click(function () {
                if ($panel.hasClass('visible')) {
                    hidePanel();
                } else {
                    showPanel();
                }
            })
        }
    });
})(jQuery);