.mvimg {
  width: 100%;
}
.mvimg img { 
  width: 100%;
}
.pconly {
  display: block;
}
.sponly {
  display: none;
}
[data-element-id].sponly {
  display: block;
  width: 400px;
}

@media (max-width: 1024px) {
  .index .mainimg {
    margin: 0;
  }
}

@media (max-width: 599px) {
  .pconly {
    display: none;
  }
  .sponly {
    display: block;
  }
}