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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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