<h3><span>投资金额</span><span>美通卡奖励</span></h3>
h3{ width:100%; height: 0.8rem; /* line-height: 0.85rem; */ display: flex; align-items: center; justify-content: space-between; }
flex 居中并两端对齐
原文：http://www.cnblogs.com/tangbuluo/p/7766958.html
