style.css

h1, h2 {
  font-family: monospace;
}

h1 {
  color: #444;
  font-style: italic;
  font-size: 2em;
}

#left-column {
  float: left;
  width: 49%;
}

#right-column {
  float: right;
  width: 49%;
  padding-left: 1em;
  border-left: thick double #000000;
}

#logo {
  width: 114px;
  height: 114px;
  animation: logo 3s infinite;
  -webkit-animation: logo 3s infinite;
}

@keyframes logo {
  0% {
    margin-left: 0;
    transform: rotate(0deg);
  }
  50% {
    margin-left: calc(100% - 114px - 5px);
    transform: rotate(1080deg);
  }
  100% {
    margin-left: 0;
    transform: rotate(0deg);
  }
}

@-webkit-keyframes logo {
  0% {
    margin-left: 0;
    -webkit-transform: rotate(0deg);
  }
  50% {
    margin-left: calc(100% - 256px - 10px);
    -webkit-transform: rotate(360deg);
  }
  100% {
    margin-left: 0;
    -webkit-transform: rotate(0deg);
  }
}