设置html背景图片属性

 #big {
            background-image: url(${basePath}/dist/img/login.png);
            background-repeat: no-repeat;
            background-position: top;
            background-attachment: fixed;
        }

        #login-body {
            left: 55%;
            position: relative;
            width: 500px;
            top: 35%;
        }