<div class="container">
  <h1>Hello world!</h1>
  <p>Find me on twitter <a href="https://twitter.com/jordienr">@jordienr</a>🤠</p>
</div>

:root {
  --main-gradient: linear-gradient(-66deg, #15162a,#000,#291a33,#000,#381a2c,#000,#121e42);
}
body, h1, a {
  font-family: sans-serif;
  margin: 0;
  color: white;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  
  width: 100vw;
  height: 100vh;
  
  background: var(--main-gradient);
  background-size: 400%;
  animation: gradient 8s ease infinite;
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 00% 50%;
  }
}