<img src="//sergeche.github.io/gpu-article-assets/images/sun-full.png" class="sun" />

html, body {
  overflow: hidden;
  background: #a02615;
  padding: 0;
  margin: 0;
}

.sun {
  position: absolute;
  top: -75px;
  left: -75px;
  animation: sun-spin 10s linear infinite;
}

@keyframes sun-spin {
	from { transform: rotate(0); }
	to   { transform: rotate(360deg); }
}