.slide-footer {
    position: fixed;
    width: 100%;
    text-align: center;
    bottom: 0;
    left: 0;
    margin: 0;
    font-size: 24px;
}

.column {
  float: left;
  width: 50%;
}

.reveal > .slides > section > section {
  transform-style: flat;
}