Aligning to the bottom in flexbox

Solution 1:

You need to make the parent a flex container:

.flex-list .flex-row .flex-item-wrapper .flex-item {
    width: 100%;
    height: 100%;
    display: flex;                      /* new */
    flex-direction: column;             /* new */
}

Then, tell the .caption element to fill available height:

.caption { flex: 1; }

Revised Fiddle

It's a common question. Here are other options:

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Solution 2:

If you change your .caption code to:

.caption {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

and then add:

.flex-item {
  display: flex;
  flex-direction: column;
}