开卷题库文字的颜色是？

<ul class="shopping-list" id="awesome">
    <li><span>Milk</span></li>
    <li class="favorite" id="must-buy"><span class="highlight">开卷题库</span></li>
</ul>

ul#awesome {
    color: red;
}
ul.shopping-list li.favorite span {
    color: blue;
}