body {
  background-color: #fffef5;
  background-image: url(../img/pc_bg_01.png);
  background-repeat: repeat;
  background-size: auto;
  background-position: top left;
}

@media screen and (max-width: 767px) {
  body {
    background-image: url(../img/sp_bg_01.png);
    background-size: auto;
  }
}