<style>
  * {
    box-sizing: border-box;
  }
  html, body {
    align-items: center;
    background: linear-gradient(45deg, #e74c3c, #00e640);
    display: flex;
    justify-content: center;
    margin: 0;
    min-height: 100vh;
    padding: 0;
    width: 100vw;
  }
  div {
    background-color: #fafafa;
    border-radius: 100%;
    height: 50px;
    margin: 0 10px;
    width: 50px;
  }
</style>
<div></div>
<div></div>
<div></div>
div {
  animation-name: fadeIn;
  animation-duration: .5s;
  animation-timing-function: ease-out;
  animation-fill-mode: backwards;
}

div:nth-of-type(1) {
  animation-delay: 1s;
}

div:nth-of-type(2) {
  animation-delay: 1.5s;
}

div:nth-of-type(3) {
  animation-delay: 2s;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
}

External CSS

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External JavaScript

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