body {
  background-color: #f4f4f4;
  font-family: monospace;
  font-size: x-large;
}


.footer {
  clear: both;
  padding: 10px;
}

input {
  display: block;
  margin-bottom: 10px;
  padding: 5px;
  font-family: monospace;
}

select, textarea {
  font-family: monospace;
}

/* Make output field visible/invisible */
.inv::selection {
  color: #000;
  background: #000;
}
.inv {
  color: #FFF;
}
.vis::selection {
  color: #FFF;
  background: #000;
}
.vis {
  color: #000;
}