Changing background color based on browser size in CSS

Question

I can't figure out what is wrong with this code. The background color doesn't change at all, it just stays white the entire time.

<style type="text/css">
      h1 {
        position: absolute;
        text-align: center;
        width: 100%;
        font-size: 6em;
        font-family: Roboto;
        transition: all 0.5s;
      }

      @media screen and (min-width: 0px) and (max-width: 400px) {
        background-color: red;
      }
      @media screen and (min-width: 401px) and (max-width: 599px) {
        background-color: green;
      }
      @media screen and (min-width: 600px) {
        background-color: blue;
      }
    </style>

Answer 1

Try:

@media screen and (min-width: 0px) and (max-width: 400px) {
    body { background-color: red; }
}
@media screen and (min-width: 401px) and (max-width: 599px) {
    body { background-color: green; }
}
@media screen and (min-width: 600px) {
    body { background-color: blue; }
}

The background-color property is now assigned to the body