body{
    margin: o auto;
    /* 水平・垂直方向の中央揃え */
    display: flex;
    justify-content: center;
    align-items: center;
    flex-flow: column;
}

div{
    vertical-align: middle;
    margin: 25px;
}

div.step_amount_submit_form{
    display: -webkit-flex;
    display: flex;
    width: 200px;
    flex-direction: column;
}

#archive_table{
    width: 200px;
}
img{
    width: 200px;
}