Full background image with fade effect

To make images fade in and out properly, one need to calculate percentages and timings for it to look good, as done below, or simply give each image a @keyframes rule of their own.

For "n" images you must define:

a=presentation time for one image

b=duration for cross fading

Total animation-duration is of course t=(a+b)*n

animation-delay = t/n or = a+b

Percentage for keyframes:

0%

a/t*100%

(a+b)/t*100% = 1/n*100%

100%-(b/t*100%)

100%

Src: http://css3.bradshawenterprises.com/cfimg/

.crossfade > div {
  animation: imageAnimation 8s linear infinite;
  backface-visibility: hidden;
  background-size: cover;
  background-position: center center;
  color: transparent;
  height: 100%;
  left: 0;
  position: fixed;
  top: 0;
  width: 100%;
}
.crossfade {
  height: 500px;
}
@keyframes imageAnimation {
  0% {
    opacity:1;
  }
  17% {
    opacity:1;
  }
  25% {
    opacity:0;
  }
  92% {
    opacity:0;
  }
  100% {
    opacity:1;
  }
}

.crossfade div:nth-of-type(1) {
  background-image: url(http://placehold.it/200/f00);
  animation-delay: 6s;
}
.crossfade div:nth-of-type(2) {
  background-image: url(http://placehold.it/200/0b0);
  animation-delay: 4s;
}
.crossfade div:nth-of-type(3) {
  background-image: url(http://placehold.it/200/00f);
  animation-delay: 2s;
}
.crossfade div:nth-of-type(4) {
  background-image: url(http://placehold.it/200/ff0);
  animation-delay: 0;
}

<div class="crossfade">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

Full background image with fade effect

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