.highlight {
  background: black;
  content: "";
  padding: 0 10px; /* Padding only on X-axis */
  display: inline;
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.fade-in-element {
  opacity: 0;
  animation: fadeIn 1s ease-in-out;
}