Note: After publishing, you may have to bypass your browser's cache to see the changes.

  • Firefox / Safari: Hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (⌘-R on a Mac)
  • Google Chrome: Press Ctrl-Shift-R (⌘-Shift-R on a Mac)
  • Internet Explorer / Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5
  • Opera: Press Ctrl-F5.
.Spoiler {
  background-color: black;
  color: black;
  border-radius: 4px;
  padding: 2px 4px;
  cursor: pointer;
  display: inline-block;
  opacity: 0;               /* start hidden */
  transition: opacity 0.5s ease, color 0.5s ease, background-color 0.5s ease;
}

.Spoiler:hover {
  animation: reveal 0.5s forwards;
}

@keyframes reveal {
  from { color: black; background-color: black; opacity: 0; }
  to   { color: white; background-color: #333; opacity: 1; }
}