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Greeting Diana Jordan! Congratulations for completing your challenge!, 👏👏👏.

they is a lot of ways to archive this overly effect, this is good resource from w3school, and also this blog post has some good information, but I did some changes to your code to make it function,

html

    <div class="images">
      <img src="images/image-equilibrium.jpg" alt="equilibrium" class="image-first">
    </div>

css

main .images{
    position: relative;
    background-color: rgb(139, 213, 218);
    border-radius: 10px;
    z-index: 1;
    overflow: hidden;
}

.image-first{
    max-width: 100%;
    transition: opacity 200ms ease-in-out;
}
.images::after{
  content: "";
  position: absolute;
  background-image: url("./images/icon-view.svg");
  background-position: center;
  background-repeat: no-repeat;
  width: 3rem;
  height: 3rem;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: all 250ms ease-in-out;
}

.images:hover .image-first{
  opacity: .2;
}
.images:hover::after {
  opacity: 1;
  visibility: visible;
  scale: 1;
}

this implementation uses css pseudo-elements, I Hope this give you some hints or tricks after all good attempt, keep coding