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;
         


        

Answer 1

Even though the above answer appears to be correct, I wanted to add a (hopefully) more readable example that also stays in 3 columns form at different widths:

.flex-row-container {
    background: #aaa;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}
.flex-row-container > .flex-row-item {
    flex: 1 1 30%; /*grow | shrink | basis */
    height: 100px;
}

.flex-row-item {
  background-color: #fff4e6;
  border: 1px solid #f76707;
}

  
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Hope this helps someone else.