刻文分界线
border-top: 1px solid rgba(255,255,255,0.3);
border-bottom: 1px solid rgba(0,0,0,0.1);
加深颜色
background: darken(deepskyblue, 2%);
https://codepen.io/team/css-tricks/pen/YqaKYR
flexbox
https://css-tricks.com/snippets/css/a-guide-to-flexbox/
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