.section {
  width: 100vw;
  height: 100vh;
  background-image: url('../images/sasa2.png');
  background-position: 50%;
  background-repeat: no-repeat;
  background-size: cover;
}

@media screen and (max-width: 479px) {
  .section {
    background-color: #31363e;
    background-image: url('../images/SaSa3.png');
    background-position: 50%;
    background-repeat: no-repeat;
    background-size: cover;
  }
}