📅  最后修改于: 2022-03-11 14:53:26.175000             🧑  作者: Mango
h2 {
width: 100%;
text-align: center;
border-bottom: 1px solid #000;
line-height: 5em;
margin: 10px 0 20px;
}
h2 span {
background:#fff;
padding:0 10px;
}