JSFiddle - React, Tailwind, and code Playground

HTML

<div id="stage"></div>

CSS

#stage{
	border: 1px solid black;
	display: block;
}

JavaScript

var stage = new Kinetic.Stage({
		container : 'stage',
		width : 900,
		height : 600
	});
	var shapesLayer = new Kinetic.Layer();
	
	/**********************************
		creating the circle object
	*************************************/
	var circle = new Kinetic.Circle({
		x : stage.getWidth() / 2,
		y : stage.getHeight() / 2,
		radius : 20,
		fill : 'grey',
		stroke : 'black',
		strokeWidth : 1,
	});

	//radius text on the circle
	var radiusText = new Kinetic.Text({
		x : circle.getX(),
        y : circle.getY(),
        text : '10',
        fontSize : 10,
        fontFamily : 'Verdana',
        fill : '#000',
        align : 'center'
	});

	//score text that stays in the background
	var scoreText = new Kinetic.Text({
		x : stage.getWidth() / 2,
		y : stage.getHeight() / 2,
		text : 'SDIFUHSDIFUHSD',
		fontSize : 50,
		fontFamily : 'Verdana',
		fill: '#CCC'
	});
	scoreText.setOffset({
		x : scoreText.getWidth() / 2,
		y : scoreText.getHeight() / 2
	});

	//circle properties 
	circle.X = stage.getWidth() / 2;
	circle.Y = stage.getHeight() / 2;
	circle.VX = 5;
	circle.VY = 5;
	circle.RAF;
	//make the circle move
	circle.move=function(){
	    // calc new balloon position
	    this.X+=this.VX;
	    this.Y+=this.VY;
	    //console.log(stage);
	    
	    // reverse if colliding
	    var radius=this.getRadius();
	    if(this.X < radius){ this.VX *= -1; this.X = radius; }
	    if(this.X > stage.getWidth()-radius){ this.VX *= -1; this.X = stage.getWidth()-radius; }
	    if(this.Y < radius){ this.VY *= -1; this.Y = radius; }
	    if(this.Y > stage.getHeight()-radius){ this.VY *= -1; this.Y = stage.getHeight()-radius; }

	    // set the new balloon position
	    this.setPosition(this.X,this.Y);
	    radiusText.setPosition(this.X,this.Y);
	    // draw it
		shapesLayer.draw();
	    // request a new animation loop
	    var b=this;
	    this.RAF=requestAnimationFrame(function(){ b.move();});
	}
	//make the circle expand when clicked...