HTML:

 <div class="book-detail-store-item align-center-vertical">居中文字</div>

 

 

CSS:

.book-detail-store-item {
       width: 50px；    height：50px；    line-height: 25px;    font-size: 12px;}/*flex垂直居中对齐*/.align-center-vertical{
        display: flex;    align-items: center;    justify-content: space-around;    flex-direction: column;}