How can I show three columns per row?

Question

I have been trying to show three columns per row. Is it possible using flexbox?

My current CSS is something like this:

.mainDiv {
    display: flex;
    margin-left: 221px;
    margin-top: 43px;
}

This code puts all content in a single row. I want to add a constraint to just shows three records per row.

Answer 1

This may be what you are looking for:

http://jsfiddle.net/L4L67/

body>div {
  background: #aaa;
  display: flex;
  flex-wrap: wrap;
}

body>div>div {
  flex-grow: 1;
  width: 33%;
  height: 100px;
}

body>div>div:nth-child(even) {
  background: #23a;
}

body>div>div:nth-child(odd) {
  background: #49b;
}

<div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>