body { 
    text-align: center; 
    padding: 150px; 
}
h1 { 
    font-size: 50px; 
}
body { 
    font: 20px Helvetica, sans-serif; 
    color: #333; 
}
article { 
    display: block; 
    text-align: left; 
    width: 650px; 
    margin: 0 auto; 
}
a { 
    color: #0277BD; 
    text-decoration: none; 
}
a:hover { 
    color: #333; 
    text-decoration: none; 
}
@media (prefers-color-scheme: dark) {
   body {
      color: white !important;
      background-color: #181a1b !important;
   }
   a:hover { 
        color: white !important; 
    }
}