css – 如果是父母,则更改孩子的背景：悬停

如果posts-item悬停,我想更改.circle.icon的bg颜色.任何想法如何实现,可能没有 Javascript？

<div id="scr1" class="large-6 columns timeline">
    <div class="line"></div>
    <ul class="posts">
        <li class="posts-item">
            <div class="circle icon"></div>
             <h2 class="posts-item-title">
                 <a href=""></a>
              </h2>
            <p class="sumMary"></p>
        </li>
    </ul>
</div>

.posts-item:hover .circle.icon {
    BACkground: green;
}