slide.css

body {
  font-size: 2em;
}

h1 {
  padding: 1em 0;
  text-align: center;
}

#wrapper {
  max-width: 800px;
  margin: 0 auto;
}

#touch {
  position: fixed;
  bottom: 0;
  right: 0;
  padding: .3em;
  z-index: 999999;
}

#touch button {
  font-size: 1em;
  background-color: rgba(0,0,0,.8);
  color: white;
  border: none;
  padding: .3em;
  -webkit-border-radius: .25em;
          border-radius: .25em;
}

#done, #next, #prev {
  display: none;
}

.hidden {
  opacity: 0;
}

.message {
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0,0,0,.8);
  color: white;
  padding: .3em;
  margin: .3em;
  -webkit-border-radius: .25em;
          border-radius: .25em;
}

@media screen and (max-width:599px) {
  body {
    font-size: 1.5em;
  }
  img {
    max-width: 100%;
  }
}