body{display:flex;flex-direction:column;}body .main-div{flex:1 1 auto;display:flex;justify-content:center;align-items:center;background-color:#f5f5f5;}body .main-div .detail-div{min-height:210px;width:350px;padding:10px;border:1px solid #ddd;border-radius:3px;background-color:#fff;}body .main-div .detail-div .header-text{margin-bottom:15px;}