<div class="poster">
  <img src="https://images.unsplash.com/photo-1507146426996-ef05306b995a?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80" alt="Cachorro" class="poster__img">
  <p class="poster__description">Tu mejor amigo</p>
</div>
body {
  display: grid;
  min-height: 100vh;
  align-content: center;
  justify-content: center;
}

.poster {
  width: 400px;
  height: 400px;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr 50px;
  border-radius: .5em;
  overflow: hidden;
}

.poster__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  grid-row: 1 / 3;
  grid-column: 1;
}

.poster__description {
  grid-row: 2;
  grid-column: 1;
  background: rgba(0,0,0,.8);
  color: #fff;
  margin: 0;
  text-align: center;
  padding: 1em;
}
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