:root {
  --background: #fdfdf8;
  --foreground: #1b1c33;
  font: 24px Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--background);
  color: var(--foreground);
  font: inherit;
  margin: 0;
  overflow: hidden;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

#switcher {
  animation: linear 24s rotate infinite;
  background:
    radial-gradient(circle at top left,     rgba(255, 0, 0, 1.0),     rgba(255, 0, 0, 0.0)     12vmax),
    radial-gradient(circle at top right,    rgba(0, 0, 255, 1.0),     rgba(0, 0, 255, 0.0)     12vmax),
    radial-gradient(circle at bottom left,  rgba(255, 255, 0, 1.0),   rgba(255, 255, 0, 0.0)   12vmax),
    radial-gradient(circle at bottom right, rgba(0, 255, 0, 1.0),     rgba(0, 255, 0, 0.0)     12vmax),
    radial-gradient(circle at top left,     rgba(255, 255, 255, 1.0), rgba(255, 255, 255, 1.0) 12vmax);
  border: none;
  border-radius: 100%;
  box-sizing: border-box;
  color: var(--foreground);
  cursor: pointer;
  height: 16vmax;
  left: -9vmax;
  position: absolute;
  top: -9vmax;
  width: 16vmax;
  z-index: 9999;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /* Disable flash when tapped */
}