<ul class="nav">
    <li class="list-item">
        <a href="#">天猫</a>
    </li>
    <li class="list-item">
        <a href="#">聚划算</a>
    </li>
    <li class="list-item">
        <a href="#">天猫超市</a>
    </li>
</ul>

.nav {
    list-style: none;
}

.nav .list-item {
    float: left;
    margin: 0 10px;
    height: 30px;
    line-height: 30px;
}

.nav .list-item a {
    padding: 0 5px;
    color: #f40;
    font-weight: bold;
    height: 30px;
    display: inline-block;
    border-radius: 14px;
}

.nav .list-item a:hover {
    background-color: #f40;
    color: #fff;
}

ul::after {
    content: '';
    display: block;
    clear: both;
}