<div class="First"></div>
<div class="Second"></div>
@keyframes fade {
  from {
    opacity: var(--fromOpacity, 0);
    transform: translate(var(--fromX, 0), var(--fromY, 0));
  }
  to {
    opacity: var(--toOpacity, 1);
    transform: none;
  }
}

.First {
  --fromY: 20px;

  animation: fade 2s 1;
}

.Second {
  --fromY: -40px;
  --fromOpacity: 1;
  --toOpacity: 0;

  animation: fade 2s 1;
  animation-fill-mode: forwards;
}

/* DEMO ONLY */

body {
  display: grid;
  grid-auto-flow: column;
  grid-gap: 100px;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: #00498A;
}
div {
  width: 100px;
  height: 100px;
}
.First {
  background-color: #FF9700;
}
.Second {
  background-color: #159F62;
}

External CSS

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External JavaScript

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