@-webkit-keyframes moveBg {
    0% {
        background-position: 0px 0px;
    }

    25% {
        background-position: -50px -50px;
    }

    50% {
        background-position: 0px -50px;
    }

    75% {
        background-position: -50px 0px;
    }
}

@keyframes moveBg {
    0% {
        background-position: 0px 0px;
    }

    25% {
        background-position: -50px -50px;
    }

    50% {
        background-position: 0px -50px;
    }

    75% {
        background-position: -50px 0px;
    }
}