<style>
#mystar {
width: 95%;
min-height: 300px;
border: 1px solid black;
background-color: black;
position: relative;
overflow: hidden;
}
</style>
</head>
<body onload="gogo()">
<h1>產生許多星星的 createElement 的作法</h1>
<div id='mystar'></div>