So I want to do what I thought was pretty basic, have a row of 6 thumbnails that would stack to two rows of 3 thumbnails on XS displays. But for some reason all of my thumbnails stack in two columns. I am sure I am missing something obvious here.So I want to do what I thought was pretty basic
阅读背景：
连续的我的缩略图不是并排的（而是堆叠在彼此的顶部）
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