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<title></title>
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.box{ width: 400px; height: 700px; background: skyblue; color: #000000; padding: 0; margin: 0;}
.box>li{ width: 120px; height: 120px; float: left; border-radius: 60px; background: #e3e3e3; list-style: none; text-align: center; line-height: 120px; margin:10px 0 0 10px}
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.hdxzq ~ li { background: tan;}
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<ul class="box">
<li>第一个孩子</li>
<li>2</li>
<li>3</li>
<li class="xlxzq">相邻选择器</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li class="hdxzq">后代选择器</li>
<li>9</li>
<li>10</li>
<li>11</li>
<li>最后一个孩子</li>
</ul>
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