Control width of flex items arranged vertically in a flex container

Question

I'm trying to achieve the effect where the boxes labeled "HALF", take up only 50% of the width (aka they share the first row evenly).

The base requirement is that they remain in a single container. Is this possible to achieve using flexbox?

I've tried playing around with flex-grow, flex-shrink, and flex-basis but I'm afraid I'm not understanding how to make it work, or if it's even possible, given the single container requirement.

Consider this fiddle: http://jsfiddle.net/GyXxT/270/

div {
  border: 1px solid;
}

.container {
  width: 400px;
  display: flex;
  flex-direction: column;
}
.child {
  
  height: 200px;
}
.child.half {
  flex: 1 1 10em;
  color: green;
}

.child:not(.half) {

  flex-shrink: 2;
  flex-basis: 50%;
  color: purple; 
}

<div class="container">
  <div class="child half">
    HALF
  </div>
  
  <div class="child half">
    HALF
  </div>
  
   <div class="child">
    FULL
  </div>
   <div class="child">
    FULL
  </div>
  <div class="child">
    FULL
  </div>
   <div class="child">
    FULL
  </div>
</div>

Answer 1

Instead of flex-direction: column, you can try a wrapping flexbox using flex-wrap: wrap; and you can set:

1. flex-basis: 50% for the half width divs

2. flex-basis: 100% for the full width divs

See that I have thrown in box-sizing: border-box to adjust for the widths when using flex-basis.

See demo below:

div {
  border: 1px solid;
  box-sizing: border-box;
}
.container {
  width: 400px;
  display: flex;
  flex-wrap: wrap;
}
.child {
  height: 200px;
}
.child.half {
  flex-basis: 50%;
  color: green;
}
.child:not(.half) {
  flex-basis: 100%;
  color: purple;
}

<div class="container">
  <div class="child half">
    HALF
  </div>

  <div class="child half">
    HALF
  </div>

  <div class="child">
    FULL
  </div>
  <div class="child">
    FULL
  </div>
  <div class="child">
    FULL
  </div>
  <div class="child">
    FULL
  </div>
</div>