Style CSS sur un écran particulier

<style>

/*Any screen above of 1000px*/
@media only screen and (min-width: 1000px) {
  *
  {
    background-color: blue !important;
  }
}

/*Any screen bellow of 1000px*/
@media only screen and (max-width: 1000px) {
  *
  {
    background-color: red !important;
  }
}

</style>
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