:root {
  --pageGrey: #212121;
  --lightBlue: #acc0ce;
  --pagePurple: #b0899f;
  --pagePink: #fff0fb;
  --pageYellow: #fadf72;
  
  --darkBlue: #42565d;
  --pageGreen: #5f9774;
  --lightGreen: #8ed29c;
  --shadowBlue: #edfff4;
  --grey: #a2a2a2;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
  background-color: #5f9774;
}
h1 {
  color: white;
  font-size: 50px;
}
span:before {
  content: 'transitions';
  text-transform: uppercase;
  font-family: arial;
  color: var(--darkBlue);
  animation: word-switch 5s linear 1;
}
@keyframes word-switch {
  0% {content: 'transitions'}
  50% { content: 'animations'}
  100% {content: 'transforms'}
}