sinatra-static-assets/examples/rsummer/public/stylesheets/mapp.css

html {
  margin: 0;
  padding: 0;
  background: #ABA418 url(src/background.png);
}

body {
  width: 600px;
  margin: 1em auto;
  padding: 1em 2em;
  border: black solid 1px;
  background-color: #D1C704;
  font: normal 14px/1.6 Arial, Helvetica, sans-serif;
}