body {
  margin: 0;
  font-family: Arial, sans-serif;
  overflow: hidden;
}

header {
  position: fixed;
  top: 0;
  height: 60px;
  width: 100%;
  background: #111;
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 20px;
  z-index: 1000;
}

.scroll-container {
  position: absolute;
  top: 60px;
  height: calc(100vh - 60px);
  width: 100%;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
}

.section {
  height: calc(100vh - 60px);
  scroll-snap-align: start;
  padding: 40px;
}

.indicator {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
}

.indicator span {
  display: block;
  width: 10px;
  height: 10px;
  margin: 10px 0;
  background: #aaa;
  border-radius: 50%;
}

.indicator span.active {
  background: #111;
}