Write me a code to add to a Google website I made that will make a ball fallow the mouse pointer
To make a ball follow the mouse pointer in a Google website, you can use JavaScript and HTML. Here's an example code:
``` 
<!DOCTYPE html>
<html>
  <head>
    <meta charset=UTF-8>
    <title>Ball Following Mouse</title>
    <style>
      #ball {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background-color: red;
        position: absolute;
      }
    </style>
  </head>
  <body>
    <div id=ball></div>
    <script>
      var ball = document.getElementById(ball);
      document.addEventListener(mousemove, function(event) {
        var x = event.clientX;
        var y = event.clientY;
        ball.style.left = (x - 25) + px;
        ball.style.top = (y - 25) + px;
      });
    </script>
  </body>
</html>
``` 
This code creates a red ball with a diameter of 50 pixels and sets its position to absolute. Then, it adds an event listener to the document that listens for mouse movements. When the mouse moves, the event listener gets the X and Y coordinates of the mouse pointer and sets the position of the ball to those coordinates minus half of the ball's diameter (to center the ball on the pointer).
Can you do a functional rewrite of this in React JSX?
Certainly! Here's a functional component in React JSX that will make a ball follow the mouse pointer:
```
import React, { useState } from react;

function Ball() {
  const [position, setPosition] = useState({ x: 0, y: 0 });

  const handleMouseMove = (event) => {
    setPosition({ x: event.clientX, y: event.clientY });
  };

  return (
    <div
      style={{
        width: 50px,
        height: 50px,
        borderRadius: 50%,
        backgroundColor: red,
        position: absolute,
        left: position.x - 25,
        top: position.y - 25,
      }}
      onMouseMove={handleMouseMove}
    ></div>
  );
}

export default Ball;
```
In this code, we define a functional component called Ball. It uses the useState hook to manage the position state of the ball, which is initialized to { x: 0, y: 0 }. We define a handleMouseMove function that updates the position state whenever the mouse moves. Finally, we render a div element that represents the ball. Its position is set to absolute and its left and top CSS properties are set based on the position state. We also attach the onMouseMove event listener to the div element to call the handleMouseMove function whenever the mouse moves.