JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main-menu">
<ul>
<li><a href="/">Stock Zone <br>Остатки складов</a></li>
<li><a href="/">Системы <br>видеонаблюдения</a></li>
<li class="active"><a href="/">Системы <br>контроля доступа</a></li>
</ul>
</div>

CSS

#main-menu {
    background: #0070CE;
    border: 0;
    width: 100%;
    height: 300px;
}
#main-menu ul li {
    position: relative;
    float: left;
	  list-style: none;
	  vertical-align: middle;
}
#main-menu ul li:first-child {
    margin-left: 0;
}
#main-menu ul li a {
    color: #fff;
    text-decoration: none;
    text-transform: uppercase;
    display: block;
    font-size: 13px;
    font-weight: bold;
	  padding: 15px 27px;
	  transition: all .5s;
}
#main-menu ul li a:hover, #main-menu li.active a {
    background: #FFE500;
	  color: #000000;
}