SOURCE

<div class="nav">
    <a href="#">Home</a>
    <a href="#">Coffees</a>
    <a href="#">Brewers</a>
    <a href="#" class="featured">Specials</a>
</div>

body {background-color: #fff;padding-top: 100px; }

.nav a {
    color: white;
    background-color: #13a4a4;
    padding: 5px 15px;
    border-radius: 2px;
    text-decoration: none;
}

.nav .featured{
    background-color: orange;
    box-shadow: 10px 2px #6f9090; /* 阴影向右偏移10px，向下偏移2px */
}