About the Matrix Rain effect
Matrix Rain recreates the falling code made famous by late-1990s science fiction. Every column of the screen has its own drop: a six-character trail of half-width katakana (ｱ, ｲ, ｳ and friends) that scrolls downward and wraps back to the top. Columns start at staggered offsets, so the rain never falls in lockstep, and the character in each trail position shifts with the column index, which keeps neighbouring streams from looking identical. The effect is dense and busy by design, so it works best as a full-screen statement rather than behind body text. Classic phosphor green on black is the obvious choice, but amber gives a retro CRT twist and pink or purple feel more synthwave. Increase the font size for a bolder, more readable rain on large displays, or shrink it for a fine, almost texture-like drizzle.