style.css

/* Root Styles */
* {
  padding:0;
  margin:0;
  font-family: 'Roboto', sans-serif;
  color: rgba(255,255,255,1);
  animation-name: fade;
  animation-duration: 8s;
}

html, body {
  margin: 0;
}

/* Body */
body {
  width: auto;
  height: 100vh;
  background-image: linear-gradient(to bottom right, #434969, #000000);
  background-repeat: repeat;
  background-attachment: fixed;
  background-size: 150%;
  animation-name: gradient;
  animation-duration: 6s;
}

/* Center text */
.center {
  margin: auto;
  width: 50%;
  text-align: center;
  padding: 10px;
  position: absolute;
}

.container{
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

/* Start Animation */
@keyframes fade {
  0%{color: rgba(255,255,255,0);}
  100%{color: rgba(255,255,255,1);}
}

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