Background Color Change Delay Exact

HTML

<!-- Swag -->

CSS

body {
    animation:color-change 5s 1;
-webkit-animation:color-change 5s 1; /* Safari and Chrome */
    animation-fill-mode: forwards;
    -webkit-animation-fill-mode: forwards;
}

@keyframes color-change
{
0% {background:#fff;}
100% {background:#000;}
}

@-webkit-keyframes color-change /* Safari and Chrome */
{
0% {background:#fff;}
100% {background:#000;}
}