body {
    background-color: hsl(0, 0%, 0%);    
    color: hsl(200, 50%, 50%);
    font-family: Tahoma;
}

body.dark {
    background-color: hsl(0, 0%, 0%);    
    color: hsl(200, 50%, 50%);
    font-family: Tahoma;
}

section {
    margin: 1em 0em;
}

main {
    margin:0 auto;
    max-width: 1000px;
}