Image at the right bottom corner

By absolute position. Demo for https://toster.ru/q/313481

HTML

<div class="parent">
   <img>
</div>

CSS

.parent {
  align-items: flex-end;
  display: flex;
  justify-content: flex-end;
  padding: 10px;
 }

/* beautiful appearance */
img, .parent {
  outline: 1px solid #ccc;
}
img {
  background: #ddd;
  height: 30px;
  width: 150px;
}
.parent {
  background: #eee;
  height: 200px;
  margin: 0 auto;
  width: 80%;
}