style.css

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

.example-project {
  display: none;
}

#example1 {
  height: 850px;
  place-items: end;
}

#circle {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: brown;
  border: 3px solid black;
  justify-self: center;
}

/* example 2 */
#example2 {
  gap: 0.8rem
}

.square {
  width: 300px;
  height: 300px;
  border-radius: 12px;
  background-color: brown;
  border: 3px solid black;
  margin: auto;
  transform: scale(1.2);
  opacity: 0;
  transition: all 0.2s ease-in;
}

.square-visible {
  transform: scale(1);
  opacity: 1;
}

/* infinity loading */
#example3 {
  position: relative;
}

.infinity-list li {
  list-style-type: none;
  width: 100%;
  max-width: 600px;
  margin: 15px auto;
  background-color: brown;
  color: rgb(255, 255, 255);
  padding: 2rem
}

.load-more {
  text-align: center;
  pointer-events: none;
  position: relative;
}

.virtual {
  position: absolute;
  height: 220px;
  top: -200px;
  width: 100%;
  pointer-events: none;
  background-color: rgba(0, 0, 0, 0.2);
}

.observer-controls {
  position: sticky;
  background-color: white;
  border-bottom: 1px solid lightgray;
  text-align: center;
  padding: 1rem;
  top: 0;
  right: 0;
  z-index: 99
}