/* 这里是设置一个全局透明度，不然不太协调，可以根据自己的喜好修改 */
:root {
    --card-bg: rgba(255, 255, 255, 0.3);
}

[data-theme='dark'] #web_bg {
  background: url('https://spjblogimg-1329562662.cos.ap-shanghai.myqcloud.com/img/wp10775144-city-anime-night-sky-wallpapers.jpg');
  background-size: cover;
}

/* 适配手机模式 */

@media (max-width: 768px) {
[data-theme='dark'] #web_bg {
    background: url('https://spjblogimg-1329562662.cos.ap-shanghai.myqcloud.com/img/wp10775144-city-anime-night-sky-wallpapers.jpg');
    background-size: cover;
  }
}