body {
  background-color: #444;
}

.container {
  margin: 0 auto;
  background-color: aqua;
  width: 40vh;
  height: 20vh;
}

@media screen and (max-width: 1000px) {
  .container {
    background-color: red;

    h1 {
      color: azure;
    }
  }
}