</div>
<div class="wrapper w2">
<div class="items">margin-top:calc(200px - 20px * 9);</div>
<div class="items">margin-top:calc(200px - 20px * 9);</div>
<div class="items">margin-top:calc(200px - 20px * 9);</div>
</div>
<div class="wrapper w3">
<div class="items">width:calc(100% / 3 - (3 * 6px));<br>margin:calc(2px * 4 );<br>padding:calc(5 * 1rem - 3rem);</div>
<div class="items";>width:calc(100% / 3 - (3 * 6px));<br>margin:calc(2px * 4 )</div>
<div class="items";>width:calc(100% / 3 - (3 * 6px));<br>margin:calc(2px * 4 )</div>
</div>
</body>
</html>
总结
calac 和flexbox搭配，用来写流式布局非常好；
