style body background-size700px 300px ; background-image urlimgqjpg ; background-position center; background-repeat no-repeat; style修改为 大小

<style>
        body{
            background-size:200px 300px ;
            background-image: url("/img/q.jpg") ;
            background-position: bottom right;
            background-repeat: no-repeat;
        }
    </style>