<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>太阳系动画</title>
    <style>
        body,
        html {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        #fps-counter {
            position: absolute;
            top: 10px;
            left: 10px;
            font-size: 24px;
            font-family: monospace;
            color: black;
            