html {
  height: 100%;
  background-color: black;

  font-size: 1em;
  overflow: hidden;
}

body {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

#main_col {
  height: 98%;
  padding: 1%;
  background-color: black;
  color: yellowgreen;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;

  font-size: 4em;
}

#file_upload {
  display: none;
}