On 
 the left side of video is JS code. simple index.html with JS SpinePlayer. On the right side it react APP.
i want the behavior be like in react app. 
Nothing from viewport is working. This is my left size index.html
#spine-container {
            width: 250px;
            height: 250px;
            position: fixed;
            bottom: 0;
            right: 0;
            z-index: 9999;
            cursor: pointer;
            box-sizing: border-box;
        }
    <main class="relative">
        <section className="fixed -bottom-4 -right-4 z-10">
            <div id="spine-container"> </div>
        </section>
    </main>
  new spine.SpinePlayer("spine-container", {
                    jsonUrl: "spider.json",
                    atlasUrl: "spider.atlas",
                    rawDataURIs: {
                        "spider.json":data:application/json;base64,${jsonBase64},
                        "spider.atlas":data:application/octet-stream;base64,${atlasBase64},
                        "spider.png":data:image/png;base64,${pngBase64}`
                    },
                    preserveDrawingBuffer: false,
                    showControls: false,
                    showLoading: false,
                    backgroundColor: "#00000000",
                    fullScreenBackgroundColor: '#00000000',
                    alpha: true,
                    scale: 1,
                    viewport: {
                        width: 250,
                        height: 250,
                        padLeft: "0%",
                        padRight: "0%",
                        padTop: "0%",
                        padBottom: "0%",
                        debugRender: true,
                        fitToCanvas: true,
                },
                debugRender: true,// Optional: Show the viewport bounds for debugging
                animation: "idle",
                success: () => console.log("Spine animation loaded!"),
                error: (err) => console.error("SpinePlayer Error:", err)
            });
and this is my react component that behavs as i want without any resizing
import { useEffect, useRef, useState } from "react";
import "@esotericsoftware/spine-player/dist/spine-player.css";
import { SpinePlayer } from "@esotericsoftware/spine-player";
type Props = {
  animation: string;
  onSpineClick?: () => void;
};
export function SpineViewer(props: Props) {
  const containerRef = useRef<HTMLDivElement | null>(null);
  const playerRef = useRef<SpinePlayer | null>(null);
  const [isReady, setIsReady] = useState(false);
  useEffect(() => {
    if (!containerRef.current || playerRef.current) return;
playerRef.current = new SpinePlayer(containerRef.current, {
  jsonUrl: "/spider/Spider-ready-psd.json",
  atlasUrl: "/spider/spider.atlas",
  animation: props.animation,
  alpha: true,
  backgroundColor: "#00000000",
  showControls: false,
  // backgroundColor: "#cccccc",
  // viewport: {
  //   debugRender: true,
  // },
  success: () => {
    console.log("Spine player loaded successfully.");
    setIsReady(true);
  },
});
return () => {
  playerRef.current?.dispose();
  playerRef.current = null;
  setIsReady(false);
};
  }, []);
  // Change animation only when ready
  useEffect(() => {
    if (isReady && playerRef.current) {
      playerRef.current.setAnimation(props.animation, true);
    }
  }, [props.animation, isReady]);
  return (
    <div
      onClick={props.onSpineClick}
      ref={containerRef}
      style={{
        width: "150px",
        height: "150px",
        zIndex: 10,
        cursor: "pointer", // Optional visual cue
        visibility: isReady ? "visible" : "hidden", // hide until ready
      }}
    />
  );
}
`