/**
 * app.css
 */
* {
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
body {
  background-color: red;
  background-image: url("images/background.png");
  font-size: 18px;
}
p {
  color: purple !important;
}
@media screen and (min-width: 600px) {
  body {
    background-color: green;
    background-image: url("images/background-600.png");
    font-size: 21px;
  }
}