body {
    background-color: rgb(40, 40, 40);
    color: rgb(51, 255, 51);
    font-family: 'Courier New', Courier, monospace;
}

h1 {
    font-size: 40pt;
    text-align: center;
}

p {
    font-size: 20pt;
    text-align: center;
}

form {
    text-align: center;
}

input {
    background-color: rgb(40, 40, 40);
    color: rgb(51, 255, 51);
    border-style: outset;
    border-color: rgb(51, 255, 51);
    font-size: 18pt;
    font-family: 'Courier New', Courier, monospace;
}

::placeholder {
    color: rgb(51, 255, 51);
}

button {
    background-color: rgb(40, 40, 40);
    color: rgb(51, 255, 51);
    border-style: outset;
    border-color: rgb(51, 255, 51);
    font-size: 18pt;
    font-family: 'Courier New', Courier, monospace;
}

#num {
    width: 520px;
}