html {
    display: flex;
    background-color: rgb(63, 63, 63);
    font-family: 'Courier New', Courier, monospace;
    color: white;
}

.mainbox {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contentbox {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.red-warning {
    color: red;
}