html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #000;
  font-family: sans-serif;
}

#overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(0,0,0,0.25);
  color: #fff;
  text-align: center;
  padding-top: 25%;
  z-index: 1000;
}

#start,
#reload {
  display: none;
}
#upload:hover,
#start:hover,
#reload:hover {
  cursor: pointer;
}
#loading {
  display: none;
}
#notes {
  display: none;
}
#progress {
  display: none;
}
#progress:before {
  content: 'loading '
}
#progress:after {
  content: '%'
}
#input {
  display: none;
}