body{background-image:url(https://firebasestorage.googleapis.com/v0/b/ta-prod-a920f.appspot.com/o/site-exam-d5cwm%2Fpublic%2F%E7%B7%8F%E6%9F%84%E8%83%8C%E6%99%AF_%E6%A8%AA2%E9%80%A3.webp?alt=media);background-repeat:repeat-x,repeat-y;background-size:200% auto;animation:scroll-bg 60s linear infinite}@keyframes scroll-bg{0%{background-position:0 0}to{background-position:100% 0}}