Open any effect, copy the HTML into your markup and the CSS into your stylesheet. Nothing else is required. Classes are prefixed per effect so several can share a page.
To change the color, set --txt-color on the element or any ancestor. To change the size, set --txt-size: offsets, shadows and letter spacing are all in em, so they follow the font size.
One-shot effects such as the typewriter and the reveals play when the element appears. To trigger them later, add the class when you need it, or toggle animation-play-state.
Every snippet ships with a prefers-reduced-motion rule that jumps straight to the finished state for people who asked their OS for less motion, so the text is always readable.