@keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@-moz-keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@-webkit-keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@-ms-keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@-o-keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}