<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>css样式设置背景颜色</title>
<style type="text/css">
body{
background-color:transparent;
}
.one{
width:500px;
height:500px;
background-color:aqua;
}
</style>
</head>
<body>
<div class="one">
1
</div>
</body>
</html>
