body {
  background-color: #000000;
}

#rpm {
    font-size: 50px;
    color: yellow;
    margin: auto;
    width: 25%;
    border: 3px solid green;
    padding: 2px;
    text-align: center;
}

#gear {
    font-size: 150px;
    color: yellow;
    margin: auto;
    width: 25%;
    border: 3px solid green;
    padding: 2px;
    text-align: center;
};