css
.align-center {
display: flex;
align-items: center;
height: 100px;
}
html
<div class="align-center">
<div>居中</div>
<div>居中</div>
<div>居中</div>
</div>
css
.align-baseline {
display: flex;
align-items: baseline;
height: 100px;
}
html
<div class="align-baseline">
<div style="font-size: 12px;">小字</div>
<div style="font-size: 16px;">中字</div>
<div style="font-size: 20px;">大字</div>
</div>