Cubic Bezier Generator

In short A CSS easing curve is defined by two control points, written `cubic-bezier(x1, y1, x2, y2)`, where x is time and y is progress. The named keywords are just presets — `ease` is (0.25, 0.1, 0.25, 1) and `linear` is (0, 0, 1, 1) — and the reason to build your own is that the defaults are too gentle for interface work and make everything feel slightly sluggish. The rule for choosing one is about where the motion should feel decisive. Elements ENTERING the screen want ease-out: fast at the start, settling at the end, so the thing arrives quickly and lands softly. Elements LEAVING want ease-in, accelerating away, because nobody needs to watch something go. Anything moving between two on-screen positions wants ease-in-out. The trick most people miss is that the y values are not clamped to 0 and 1. A y above 1 overshoots and springs back, which is how you get a bounce without keyframes, and a negative y undershoots first — pulling back before moving forward, like a wind-up. Both read as playful, so use them on one or two elements rather than everywhere.