How to change the flex order when wrapping?

Question

I would like to achieve something that renders like this, depending on the screen size:

+---------------------------+
|  A  |       B       |  C  |
+---------------------------+

+---------------+
|   A   |   C   |
|       B       |
+---------------+

If all size are fixed, I can manage using the flex order property but the size of my C container is not fixed and so I can't use a static media query.

Is there a way to achieve this?

Edit: I managed a good enough approximation: In a media query selecting all screens that might need wrapping, I change the order of the B container to something big, and at the same time, I set its min-width to 100% which forces the wrap.

Answer 1

You can make b element full width with flex: 0 0 100% and change order to order: 2 with media queries DEMO

* {
  box-sizing: border-box;
}
body, html {
  margin: 0;
  padding: 0;
}
.content {
  display: flex;
  flex-wrap: wrap;
}
.b {
  background: lightblue;
}
.a, .b, .c {
  border: 1px solid black;
  flex: 1;
  padding: 10px;
}
@media(max-width: 768px) {
  .b {
    flex: 0 0 100%;
    order: 2;
  }
}

<div class="content">
  <div class="a">A</div>
  <div class="b">B</div>
  <div class="c">C</div>
</div>