@keyframes fadeIn {
    0% { opacity: 0 }
    100% { opacity: 1 }
}
@-webkit-keyframes fadeIn {
    0% { opacity: 0 }
    100% { opacity: 1 }
}
@keyframes fadeOut {
    0% { opacity: 1 }
    100% { opacity: 0 }
}
@-webkit-keyframes fadeOut {
    0% { opacity: 1 }
    100% { opacity: 0 }
}