@media (max-width: 768px) {
#PC1 {
    display: none;
  }
#mobile1 {
display: block;
 }
}
.mobileShow {display: none;} 

  /* Smartphone Portrait and Landscape */ 
  @media (max-width: 768px) { 
      .mobileShow {display: inline;}
  }
  
  .mobilenoShow {display: none;} 

  /* Smartphone Portrait and Landscape */ 
  @media (min-width: 768px) { 
      .mobilenoShow {display: inline;}
  }
  video {
    width: 100%;
    height: auto;
    max-height: 100%;
}