style.css

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

html {
  font-size: 62.5%;
}

body {
  height: 100vh;
  background-color: rgb(7, 4, 42);
  color: #fff;

  display: flex;
  align-items: center;
  justify-content: center;
  filter: blur(1px);
}

.box {
  background-color: rgb(82, 82, 82);
  width: 60rem;
  border: 2px solid #fff;
  padding: 2.4rem;
  animation: move 10s step-start infinite forwards;
}

h1 {
  text-align: center;
  font-size: 3.6rem;
  margin-bottom: 2.4rem;
}

h2 {
  font-size: 3.6rem;
  text-align: center;
  background-color: gray;
  margin-bottom: 2.4rem;
}

h3 {
  font-size: 2.4rem;
}

@keyframes move {
  0.0% {
    transform: translate(0, -30px);
  }
  100% {
  }
  19.6% {
    transform: translate(0, -60px);
  }
  39.6% {
    transform: translate(0, -90px);
  }
  59.7% {
    transform: translate(0, -60px);
  }
  80.4% {
    transform: translate(0, -30px);
  }
}

@media (max-width: 41.25em) {

  html {
    font-size: 50%;
  }

  .box {
    margin: 0 auto;
    width: 90%;
  }
}