body {
  background-color: #222222;
  color: white;
  font-family: 'Source Sans Pro', sans-serif;
}

body.presentation {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh; /* Full viewport height */
  width: 100%;  /* Full viewport width */
}

#splash {
  animation: Brighten 4s linear;
  padding: 0px;
  text-align: center;
  position: absolute;
  height: 450px;
  width: 300px;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

#logo {
  animation: Spin 4s linear;
  height: 248px;
  width: 248px;
}

.button {
  animation: Reveal 4s;
  display: inline-block;
  color: greenyellow;
  font-weight: bold;
  text-decoration: none;
  margin: 10px;
  padding: 5px;
  width: 100px;
  border: 2px solid greenyellow;
  border-radius: 10px;
}

.button:hover, .button:active {
  background-color: greenyellow;
  color: #222222;
}

@keyframes Spin {
  from { transform: rotateY(0deg);}
  to { transform: rotateY(360deg);}
}

@keyframes Brighten {
  from { opacity: 0.0; }
  to { opacity: 1.0; }
}

@keyframes Reveal {
  0% { opacity: 0.0; }
  99% { opacity: 0.0; }
  100% { opacity: 1.0; }
}