/* animation */
@-webkit-keyframes fadeIn {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

@keyframes fadeIn {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

#content {
    transition: all 0.25s ease-in-out;
    -moz-transition: all 0.25s ease-in-out;
    -webkit-transition: all 0.25s ease-in-out;
}