动画会创建可移动页面内容的div吗？

Question

I have the following site on which I tried implementing a very nice looking animation. I don't know why but it keeps creating white space around my page and if I also add a button (as I did in the fiddle) it just goes crazy. What is the solution to this?

FIDDLE: https://jsfiddle.net/7suL84my/

CODE OF ANIMATION:

// Some random colors
const colors = ["#3CC157", "#2AA7FF", "#1B1B1B", "#FCBC0F", "#F85F36"];

const numBalls = 50;
const balls = [];

for (let i = 0; i < numBalls; i++) {
let ball = document.createElement("div");
ball.classList.add("ball");
ball.style.background = colors[Math.floor(Math.random() * colors.length)];
ball.style.left = `${Math.floor(Math.random() * 100)}vw`;
ball.style.top = `${Math.floor(Math.random() * 100)}vh`;
ball.style.transform = `scale(${Math.random()})`;
ball.style.width = `${Math.random()}em`;
ball.style.height = ball.style.width;

balls.push(ball);
document.body.append(ball);
}

// Keyframes
balls.forEach((el, i, ra) => {
let to = {
x: Math.random() * (i % 2 === 0 ? -11 : 11),
y: Math.random() * 12
};

let anim = el.animate(
 [
  { transform: "translate(0, 0)" },
  { transform: `translate(${to.x}rem, ${to.y}rem)` }
],
{
  duration: (Math.random() + 1) * 2000, // random duration
  direction: "alternate",
  fill: "both",
  iterations: Infinity,
  easing: "ease-in-out"
}
);
});

Answer 1

From your link on the css file change this :

#main{
background-color:black;
color:white;
width:98%;
height:98%;
align-content: center;

}

to this:

#main{
background-color:black;
color:white;
width:100%;
height:100%;
align-content: center;

}