index.css

@font-face {
  font-family: "Test";
  src: url("./fonts/test.woff2") format("woff2");
}

.index {
  background: url("http://google.com");
}

.quotes {
  background: url("data:image/gif;base64,quotes");
}

.no-quote {
  background: url(data:image/gif;base64,no-quote);
}