JSFiddle - React, Tailwind, and code Playground

HTML

<div class="menu">
    <ul>
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li>Item 4</li>
        <li>Item 5</li>
        <li>Item 6</li>
        <li>Item 7</li>
        <li>Item 8</li>
        <li>Item 9</li>
        <li>Item 10</li>
        <li>Item 11</li>
        <li>Item 12</li>
    </ul>
</div>

CSS

.menu {
    width: 100%;
    min-width: 960px;
    overflow: hidden;
    height: 46px;
    background-color: rgb(0, 85, 56);
    box-shadow: rgb(0, 0, 0) 0px 8px 12px -12px;
    -webkit-box-shadow: rgb(0, 0, 0) 0px 8px 12px -12px;
    -moz-box-shadow: rgb(0, 0, 0) 0px 8px 12px -12px;
}
.menu ul {
    list-style-type: none;
    margin: 10px 121.5px;
    width: 300px;
    overflow: hidden;
    position: relative;
}
.menu ul li {
    margin: 0 12px 20px 0;
    display: inline-block;
    white-space: nowrap;
}
.menu ul li a {
    color: #fff;
    padding: 3px 10px;
    display: inline-block;
    border-radius: 3px;
    background-color: rgb(0, 85, 56);
    text-decoration: none;
}
ul.active {
    color: red;
}

JavaScript

$(".menu ul").hover(function () {
    $(this).children.stop().animate({
        left: "-100px"
    }, 1000);
}, function () {
    $(this).children.stop().animate({
        left: "0"
    }, 1000);
});