As you can see here: JSFiddle
I want author div to be at the bottom of his parent container. I tried with align-self: flex-end; but it's not working. What am I doing wrong?
.flexbox {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.item {
  display: flex;
  flex-direction: column;
  width: 100px;
  border: 1px solid #000;
  padding: 10px;
}
.item .author {
  width: 100%;
  align-self: flex-end;
  border: 1px solid #000;
}<div class="flexbox">
  <div class="item">
    <div class="title">
      Title
    </div>
    <div class="content">
      Content
    </div>
    <div class="author">
      Author
    </div>
  </div>
  <div class="item">
    <div class="title">
      Title
    </div>
    <div class="content">
      Content<br>Content
    </div>
    <div class="author">
      Author
    </div>
  </div>
  <div class="item">
    <div class="title">
      Title
    </div>
    <div class="content">
      Content<br>Content<br>Content
    </div>
    <div class="author">
      Author
    </div>
  </div>
</div> 
     
     
     
    