.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center; /* This centers inline content horizontally */
}

.hover{
  animation: moveUpDown 2s infinite alternate ease-in-out; /* Name, duration, iteration, direction */
}

body {
  background-color: #000000;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
}

@keyframes moveUpDown {
  to { transform: translatey(15px);}
}