Suppose you want your Twine game to have that classic feel to it. You want pages to snap into place instantly, without even a moment of fade-in. All business. 90s web style. So sudden that it's like the game can read your thoughts.
Well, here's some CSS code that suppresses the default fade-in transition between passages.
If you're using Transition CSS, use this:
.transition-out { display:none; }
Otherwise, use this:
.passage { opacity:1 !important; }
All this code does is remove functionality, which is why it's pretty simple. It will also work with Jonah as well as Sugarcane.
If you want more types of transitions, also see this code for an alternative transition engine for Sugarcane. Feel free to report any bugs to @webbedspace.