body {
  background-color: #0f0;
}
#custom,
#instructions {
  background-color: black;
  color: white;
  font-family: monospace;
}
#custom {
  font-size: 40pt;
}
#instructions {
  font-size: 20pt;
}
#counter,
#custom {
  display: none;
}
#customValue {
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
}
#customButton {
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
  background-color: lightgreen;
}
::selection {
  background-color: rgba(0, 0, 0, 0);
}