Template:Spoiler/styles.css

.spoiler-text {
  background-color: #111;
  color: transparent;
  transition: color 0.3s ease;
  border-radius: 3px;
  padding: 0 4px;
  border: 1px solid #444;
  cursor: help;

}

.spoiler-text:hover {
  color: #fff !important;

}