html, body{
    height: 100%;
    width: 100%;
  }
  body{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
  }
  #main {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    place-content: center;
    padding: 50px;
  }
  #footer {
    padding: 20px;
  }
  #footer img {
    height: 30px;
  }
  #drop_zone {
    height: 100px;
    border: 2px dashed #ccc;
    font-size: 24px;
    color: #ccc;
    cursor: pointer;
    border-radius: 8px;
    max-width: 600px;
    display: flex;
    align-items: center;
    place-content: center;
    background-color: #f7f7f7;
    background-image: url('upload-icon.png');
    background-position: 65px 38px;
    background-repeat: no-repeat;
    background-size: 40px;
    padding-left: 48px;
  }
  #drop_zone:hover {
    border: 2px dashed #3598d9;
    color: #3598d9;
  }
  #drop_zone img {
    height: 24px;
    vertical-align: middle;
    padding-right: 10px;
  }
  #drop_zone.good-file {
    border: 2px dashed #3598d9;
    color: #3598d9;
  }
  #drop_zone.bad-file {
    border: 2px dashed #ff1b1b;
    color: #ff1b1b;
    background-color: #ffe7e7;
    background-image: url('error.png');
  }
  #help {
    margin-top: 20px;
    font-size: 12px;
    color: #666;
    text-align: center;
  }