body {
background: #000; 
font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
width: 640px;
margin: 90px auto;
font-size: 18px;
line-height: 28px;
text-rendering:optimizeLegibility;
color: rgba(255,255,255,0.75);
}