slidecss.css

<style type="text/css">
 
.slider {
    margin-top: 0px;
  max-width:100%;
  height:85%;
  position: relative;
}
.slide1,.slide2,.slide3,.slide4,.slide5 ,.slide6 {
  position: absolute;
  width: 100%;
  height: 85%;
}
.slide1 {
  background: url('barca.jpg')no-repeat center;
      background-size: cover;
    animation:fade1 20s infinite;
-webkit-animation:fade1 20s infinite;

} 
.slide2 {
  background: url('basketball.jpg')no-repeat center;
      background-size: cover;
    animation:fade2 20s infinite;
-webkit-animation:fade2 20s infinite;
}
.slide3 {
    background: url('volleyball.jpg')no-repeat center;
      background-size: cover;
    animation:fade3 20s infinite;
-webkit-animation:fade3 20s infinite;
}
    .slide4 {
    background: url('swimming.jpg')no-repeat center;
      background-size: cover;
    animation:fade4 20s infinite;
-webkit-animation:fade4 20s infinite;
}
@keyframes fade1
{
  0%   {opacity:1}
  25% { opacity: 0}
  50% { opacity: 0}
  75% { opacity: 0}
  100% { opacity: 1}
}
@keyframes fade2
{
 0%   {opacity:0}
  25% { opacity: 1}
  50% { opacity: 0}
  75% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade3
{
  0%   {opacity:0}
  25% { opacity: 0}
  50% { opacity: 1}
  75% { opacity: 0}
  100% { opacity: 0}
}
    @keyframes fade4
{
  0%   {opacity:0}
  25% { opacity: 0}
  50% { opacity: 0}
  75% { opacity: 1}
  100% { opacity: 0}
}
</style>