Gandalf image

gistfile1.txt

<div class="picture">
  <img src="http://images.innoveduc.fr/integration_gandalf.png">
  <div class="cover">
    <div class="reward">
      Reward <span class="amount">1000</span><br> golden coins
    </div>
    <div class="name">Gandalf</div>
  </div>
</div>

gistfile2.txt

.picture {
  position: absolute;
  font-family: Arial;
  display: flex;
}

.cover {
  position: absolute;
  background-color: rgba(255,255,255,0.4);
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

.reward {
  font-size: 2em;
  background-color: rgba(255,255,255,0.8);
  padding: 0.5em 2em;
  margin: 1em;
  border-radius: 10px;
}

.amount {
  color: orange;
}

.name {
  font-size: 3.5em;
  color: white;
  padding: 2em 0em;
}

.cover:hover {
  background-color: rgba(0,0,0,0);
  justify-content: flex-end;
}

.cover:hover >.reward {
  display: none;
}

.cover:hover .name {
  font-size: 1.5em;
}

gistfile3.txt

https://codepen.io/51enra/full/oNNyyXq