Check out example codes for "change pictures at time css". It will help you in understanding the concepts better.

Code Example 1

@keyframes cf3FadeInOut {
  0% {
  opacity:1;
}
45% {
opacity:1;
}
55% {
opacity:0;
}
100% {
opacity:0;
}
}

#cf3 img.top {
animation-name: cf3FadeInOut;
animation-timing-function: ease-in-out;
animation-iteration-count: infinite;
animation-duration: 10s;
animation-direction: alternate;
}

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