#cf .top{
    width: 100%;
    margin:0 auto;
    -webkit-transition: opacity 1s ease-in-out;
    -moz-transition: opacity 1s ease-in-out;
    -o-transition: opacity 1s ease-in-out;
    transition: opacity 1s ease-in-out;
}
  
#cf .bottom {
    width: 100%;
    position:absolute;
    left:0;
    -webkit-transition: opacity 1s ease-in-out;
    -moz-transition: opacity 1s ease-in-out;
    -o-transition: opacity 1s ease-in-out;
    transition: opacity 1s ease-in-out;
}
  
@keyframes cf3FadeInOut {
    0% {
    opacity:1;
    }
    45% {
    opacity:1;
    }
    55% {
    opacity:0;
    }
    100% {
    opacity:0;
    }
}
  
#cf .top {
    animation-name: cf3FadeInOut;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-duration: 6s;
    animation-direction: alternate;
}