:root {
  --percentage: 0%;
}

body {
  background-color: #000;
  margin: 0;
  height: 300vh;
}

.sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

h1,h2 {
  font-family: 'Roboto Condensed';
  margin: 0;
  padding: 0;
  font-size: 48px;
  color: #fff;
  letter-spacing: -0.3px;

  background-image: linear-gradient(75deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 33.33%, rgba(255, 255, 255, 0) 66.67%, rgba(255, 255, 255, 0) 100%);
  background-size: 300% 100%;
  background-position-x: calc(100% - var(--percentage));

  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}