style.css

body {
  background: #1e252c;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: #fff;
  overflow: hidden;
}
h1 {
  font-size: 4rem;
  font-weight: 100;
  margin: 0;
  padding: 0;
}
.brand {
  margin-top: 0.5rem;
  font-size: 1.2rem;
  font-weight: 100;
}
.cover {
  display: grid;
  min-height: 100vh;
  text-align: center;
}
.feature {
  animation-duration: 3s;
  animation-name: fadeIn;
  animation-fill-mode: both;
  background: url(jx.svg) no-repeat center 50px;
  background-size: 500px 500px;
  padding: 12rem 2rem 0;
  -webkit-animation-fill-mode: both;
  -webkit-animation-name: fadeIn;
  -webkit-animation-duration: 3s;
}
@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}