.scroll-container {
  height: 100vh;
  background: black;
}
.speak {
  
  margin: 150vh 0;
  &:first-child {
    margin-top: -50vh;
   
    
 
  }
}





.speak[data-scroll] {
  
  /* Uncomment the transition property if you want opacity to transition */
  transition: opacity .3s; 
  
  transform: translateY(calc(var(--viewport-y) * 30vh));
  opacity: calc(var(--visible-y));
}

.scroll-sequence__content {
  
  padding: 4em;
}
.scroll-sequence {
  position: sticky;
  position: -webkit-sticky;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: -5;
  height: 100vh;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}



h1 {
  font-size: 3em;
  margin-bottom: 10px;
  @media screen and (max-width: 600px) {
    font-size: 2em;
    width: 100%;
  }
}



:root {
  font-size: 20px;
  font-family: 'Open Sans', sans-serif;
  color: white;
  text-shadow: 0 0 12px rgba(black, .8);
}
body {
  margin: 0;
}

* {
  box-sizing: border-box;
}