It may look cool, but it actually makes the script harder to read. Try to keep it under 120 pages, but no shorter than 100 pages. Longer screenplays used to be more acceptable. However, the trend is toward shorter, punchier scripts. A general rule of thumb is a page per minute.
Comedies tend to be shorter than dramas.
Don t cheat by widening your dialogue margins. The standard width is a maximum of 33 characters. Wider margins make it difficult to estimate the running time. Even worse, a wide swath of dialogue may convey the impression that your script reads slow. Run a spell-check.