/*** for PC Browser ***/
@media (min-width:401px)
{
.video{
  position:relative;
  width:100%;
  padding-top:56.25%;
}
.video iframe{
  position:absolute;
  top:0;
  right:0;
  width:100%;
  height:100%;
}
}


/*** for Smart Phone ***/
@media (max-width:400px)
{
.video{
  position:relative;
  width:100%;
  padding-top:56.25%;
}
.video iframe{
  position:absolute;
  top:0;
  right:0;
  width:100%;
  height:100%;
}
}