/*背景图片*/
body {
background: url("https://images.cnblogs.com/cnblogs_com/blogs/794776/galleries/2314182/o_230531045050_105475685_p0_master1200.jpg") fixed;
background-size: cover;
background-repeat: no-repeat;
opacity:0.8 /* x取值为[0, 1]，1为不透明，具体可自行测试 */
}
Live2D