如圖：

html代碼：

1 <div class="detail-news">
2         <h5 class="detail-news-title">
3             <span>詳細信息</span>
4         </h5>
5 </div>

css代碼：

 1 .detail-news-title{
 2     font-size: 16px;
 3     font-weight: normal;
 4     text-align: center;
 5     padding-top
 
: 10px;
 6     position: relative;
 7 }
 8 .detail-news-title::before{
 9     content: "";
10     display: block;
11     width: 60vw;
12     height: 1px;
13     background: #333;
14     position: absolute;
15     left: 50%;
16     margin-left: -30vw;
17     top: 18px;
18 }
19 .detail-news-title span{
20     padding
 
: 0 10px;
21     background: #fff;
22     position: relative;
23     z-index: 2;
24 }

CSS實現：標題兩側畫線效果