Choose an animation — fade, slide, bounce, spin, or pulse — and set the duration and easing, and the tool outputs the @keyframes rule plus the animation shorthand to apply it.
Yes. The output is plain CSS — edit the duration and timing-function values directly in the animation shorthand line.
Yes. The output is plain CSS — add it to any stylesheet or CSS-in-JS setup that accepts raw CSS.
Only where selectors or property names match. Check specificity and load order if you see conflicts with existing rules.