两个span元素，其中一个设置vertical-align:middle
p {
background-color: gray;
/* line-height: 60px; */
}
.special {
display: inline-block;
background-color: white;
vertical-align: middle;
font-size: 50px;
}
.model {
display: inline-block;
background-color: white;
font-size: 50px;
}
<p><span class="special">X</span><span class="model">X</span></p>
