@keyframes mydownup {
    0% {
        margin-top: -100px;
    }

    25% {
        margin-top: -50px;
    }

    50% {
        margin-top: -10px;
    }

    100% {
        margin-top: 0px;
    }
}

@-webkit-keyframes mydownup {
    0% {
        margin-top: -100px;
    }

    25% {
        margin-top: -50px;
    }

    50% {
        margin-top: -10px;
    }

    100% {
        margin-top: 0px;
    }
}

@-o-keyframes mydownup {
    0% {
        margin-top: -100px;
    }

    25% {
        margin-top: -50px;
    }

    50% {
        margin-top: -10px;
    }

    100% {
        margin-top: 0px;
    }
}

@-moz-keyframes mydownup {
    0% {
        margin-top: -100px;
    }

    25% {
        margin-top: -50px;
    }

    50% {
        margin-top: -10px;
    }

    100% {
        margin-top: 0px;
    }
}