@import url("resetsheet.css");
body {
  overflow: hidden; }

div {
  width: 100%;
  height: 100%;
  background-color: red;
  animation-name: example;
  animation-duration: 4s;
  animation-iteration-count: infinite;
  animation-direction: alternate; }

@keyframes example {
  from {
    background-color: red; }
  to {
    background-color: yellow; } }