body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: black;
    color: white;
}

a {
    color: white;
}

a:visited {
    color: white;
}

/* for tanks/3d figures */
#mainframe {
    display: block;
    margin: auto;
    margin-top: 1rem;
    width: 95vw; 
    height: 80vh; 
    border: 2px solid white;
}