* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}


.spvideo{
  display: block;
  width: 100%;
  height: 100vh;
  object-fit: cover;
}
.pcvideo{
  display: none;
}

@media screen and (min-width: 740px) {
  .spvideo {
    display: none;
  }
  .pcvideo {
    display: block;
    width: 100%;
    height: 100vh;
    object-fit: cover;
  }
}