body {
  font-family: sans-serif;
  font-size: 2rem;
}
* {
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}
.demo-content{
   display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 80vh;
  background: #e3e3e3;
}

.sticky-wrapper{
  position: relative;
  width: 100%;
  height: 400vh;
}
.sticky-container{
  position: absolute;
  height: 100vh;
  width: 100%;
  top: 0;
  left: 0;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}