@keyframes fly{0%{background-position:0 50%}50%{background-position:100% 50%}to{background-position:0 50%}}.animated-background{background-image:url(https://images.unsplash.com/photo-1508614999368-9260051292e5?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80);background-size:cover;background-position:50%;animation:fly 20s linear infinite;height:100vh;width:100%;position:fixed;top:0;left:0;z-index:-1}