几种简单的垂直居中方式

.box1{
    display: flex;
    justify-content:center;
    align-items:Center;
}

.box{
    display:tabel;    
}
.sub{
    display: table-cell;
    vertical-align: middle;      
}

.box{
    height: 2rem;
    overflow: hidden;
}
.sub{
    margin-top: 1rem;
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
}