JSFiddle - React, Tailwind, and code Playground

HTML

<!-- Demo created by Rob W http://stackoverflow.com/users/938089/rob-w -->

CSS

body {
    background-image: url("http://www.animaatjes.nl/disney-plaatjes/disney-plaatjes/finding-nemo/nemo11.gif"), url("http://images2.layoutsparks.com/1/200022/ocean-dreams-blue-waves.jpg");
    background-repeat: no-repeat;
    background-position: 50% 0%, 0;
    -moz-animation: swim 2s linear 0s infinite;
    -webkit-animation: swim 2s linear 0s infinite;
    animation: swim 2s linear 0s infinite;
}
@-moz-keyframes swim {
    from { background-position: 200% 0, 0 0; }
    to  { background-position: -100% 0, 0 0; }
}
@-webkit-keyframes swim {
    from { background-position: 200% 0, 0 0; }
    to  { background-position: -100% 0, 0 0; }
}
@keyframes swim {
    from { background-position: 200% 0, 0 0; }
    to  { background-position: -100% 0, 0 0; }
}