JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="header-menu" >
        <li class="active" >
            <a href="#">Главная</a>
        </li>
        <li>
            <a href="#">Скачать</a>
            <div class="drop-arrow" >&nbsp;</div>
            <ul class="drop-menu" >
                <li>
                    <a href="#link">LINK</a>
                </li>
                <li>
                    <a href="#link">LINK</a>
                </li>
                <li>
                    <a href="#link">LINK</a>
                </li>
            </ul>
        </li>
        <li>
            <a href="#">Об игре</a>
        </li>
        <li>
            <a href="#">Литература</a>
            <span class="drop-arrow" >&nbsp;</span>
            <ul class="drop-menu" >
                <li>
                    <a href="#link">LINK</a>
                </li>
                <li>
                    <a href="#link">LINK</a>
                </li>
                <li>
                    <a href="#link">LINK</a>
                </li>
            </ul>
        </li>
    </ul>

CSS

body {
    min-width: 960px;
}
ul, li {
    margin: 0;
    padding: 0;
    list-style: none;
}

.header-menu {
    min-height: 44px;
    background: url(http://atemiks.meximas.com/test/bg-menu.gif) repeat-x #000;
}

.header-menu li {
    position: relative;
    float: left;
}
.header-menu li:hover {
    background: url(http://atemiks.meximas.com/test/b-portal-menu.png) repeat-x 0 0;
}

.header-menu a {
    display: block;
    padding: 12px 36px;
    border-left: 1px solid #353538;
    border-right: 1px solid #161618;
    color: #fff;
    text-decoration: none;
}
.header-menu a:hover {
    border-left-color: #923C26;
}

.header-menu .drop-arrow {
    cursor: pointer;
    position: absolute;
    top: 0;
    right: 0;
    width: 20px;
    height: 44px;
    background: url(http://atemiks.meximas.com/test/b-portal-menu.png) no-repeat 0 -264px;
}

.header-menu .drop-menu {
    position: absolute;
    width: 100%;
    background: #333;
}
.header-menu .drop-menu li {
    clear: both;
    width: 100%;
}

.header-menu .active, .header-menu .active:hover {
    background: url(http://atemiks.meximas.com/test/b-portal-menu.png) repeat-x 0 -44px;
}
.header-menu .drop-arrow:hover {
    background: url(http://atemiks.meximas.com/test/b-portal-menu.png) no-repeat 0 -352px;
}