.youtube25 {
  width: 100%;
  display: flex;
}
.youtube25L {
  width: 40%;
  margin: 5px 15px 0 5px;
}
.youtube25L img{width: 100%;}

.youtube25R {
  width: 60%;
}
/* RESPONSIVE 設定
------------------------------------------------------------*/
@media only screen and (max-width:960px) {}
@media only screen and (max-width: 799px) {}
@media only screen and (max-width:640px) {
  .youtube25 {
    display: block;
  }
  .youtube25L {
    width: 95%;
    margin: 3px auto 10px;
  }
  .youtube25R {
    width: 100%;
  }
}