body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
}

.content {
  padding: 2rem;
}

.filler {
  height: 2000px;
}

#scrollBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  font-size: 1.5rem;
  padding: 0.75rem 1rem;
  background-color: #0077cc;
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 999;
}

#scrollBtn.show {
  opacity: 1;
  pointer-events: auto;
}