Use flex:

<div class="wrap">
  <span>Align me to the bottom</span>
</div>

CSS:

.wrap {
  height: 200px;
  width: 200px;
  border: 1px solid #aaa;
  margin: 10px;
  display: flex;
}

.wrap span {
  align-self: flex-end;
}

Reference:

• https://stackoverflow.com/questions/17123327/align-text-to-the-bottom-of-a-div