@charset "utf-8";
a{
color: blue;
}

.dh {
color: white;
width: 99%;
animation-name: dh;
animation-duration: 4s;
animation-iteration-count: infinite;
}

@keyframes dh {
0% {background-color: white;}
25% {background-color: black;}
50% {background-color: red;}
75% {background-color: green;}
100% {background-color: blue;}
}