body {
  margin: 0;
  overflow: hidden;
}

input#matrixInput {
  color: #1acc1a;
  background: #010102;
  border: 0;
  width: 100px;
}
form {
  width: 100px;
  height: 20px;
  position: absolute;
  left: 45%;
  top: 90%;
}
input#matrixInput::placeholder {
  color: #1acc1a;
}
input#matrixInput:focus {
  outline: none;
  box-shadow: none;
}