如何在博客园当中添加背景图片

/*背景图片*/
body {
color: #000;
background: url(http://images2015.cnblogs.com/blog/969197/201703/969197-20170325160900815-1058599404.jpg
) fixed;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 101%;
}