body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
height: 100vh;
  overflow: hidden;
width: 100%;
margin: 0;
padding: 0;
background-color: #BFBFBF;
color: #000000;
text-align: center;
vertical-align: central;
} 
html {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}

@media (prefers-color-scheme: dark) {
body {
background-color: #1E1E1E;
color: #CCCCCC;
}