背景图设置

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            /*默认不重复*/
            background:url('./1.png') no-repeat;
            /*背景色在背景图片下层*/
            background-color:green;
        }
        .box{
            position:absolute;
            /*float:right; 和 position 是冲突的*/
            top:200px;
            left:200px;
            background:red;
            width:100px;
            height:100px;
        }
    </style>
</head>
<body>
    <form action="">
        <input type="text">
        <input type="text">
        <div class="box"></div>
        <!--z-index 越大越靠近前-->
        <div class="box" style="z-index:1000;background:blue;top:250px;left:250px;"></div>
    </form>
</body>
</html>
效果: