使用Bootstrap重新排序移动设备上的项目

I have a website written in Bootstrap where among other things I have two .rows in a container with 3 items in each row, namely an image with some text below and whatnot. It looks good on desktops but i'm unsure how exactly to make the browser reorder things on mobile so that each item on the rows are listed one by one on top of each other with the items being centered and there being some spacing on either side of the items. I have a website written in Bootstrap where amo