html, body {
  font-family: sans-serif;
}
#drop_zone {
  height: 98%;
  border: dashed 5px gray;
  color: gray;
  text-align: center;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}
#guide {
  font-size: 500%;
  margin-top: 0;
  margin-bottom: 0;
}
#title {
  font-size: 150%;
  font-weight:bold;
  margin-top: 20px;
  margin-bottom: 5px;
}
#description {
  margin-top: 10px;
  margin-bottom: 10px;
}