共计 943 个字符，预计需要花费 3 分钟才能阅读完成。
<section style="margin: 10px auto;outline: 0px;max-width: 100%;text-align: center;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;display: inline-block;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section hm_fix="348:528" style="padding: 3px;outline: 0px;max-width: 100%;box-sizing: border-box;border-width: 0px;border-color: rgb(0, 0, 0);background-color: rgb(163, 61, 38);overflow-wrap: break-word !important;"><section hm_fix="361:762" style="padding: 1px 20px;outline: 0px;max-width: 100%;box-sizing: border-box;border-width: 1px;border-style: solid;border-color: rgb(255, 255, 255);overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;letter-spacing: 1.5px;color: rgb(255, 255, 255);box-sizing: border-box !important;overflow-wrap: break-word !important;"> 这是一个小标题 </section></section></section></section></section> 复制代码上面这段代码效果，怎么用：<h2> 这是一个小标题 </h2> 复制代码这样表现出来？CSS 应该怎么写？
