body{
  max-width: none;
}
article{
  max-width: 1100px;
  align-items: center;
  margin: 0 auto;
  position: relative;
}
/*YouTubeセクション*/
#main_date{
  font-size: 15px;
  margin-top: 17px;
  margin-left: 150px;
  margin-right: 150px;
}
#reiko_movie h2{
  font-size: 22px;
  font-weight: bold;
  margin-top: 30px;
  margin-left: 150px;
  margin-right: 150px;
}
.reikomovie{
  background-color: #2A3F7B;
  width: 80%;
  height: auto;
  aspect-ratio: 16 / 9.5;
  margin: 0 auto;
  margin-top: 52px;
  display: flex;
  justify-content: center;
  align-items: center;
}
iframe.movie1{
  width: 94%;
  height: auto;
  aspect-ratio: 16 / 9;
}
#reiko_movie_text{
  max-width: 672px;
  margin: 0 auto;
  margin-top: 53px;
  margin-bottom: 150px;
  line-height: 24px;
}
/*レスポンシブ対応*/
@media (max-width:899px){
  #main_date{
    font-size: 13px;
    margin-top: 17px;
    margin-left: 10%;
    margin-right: 10%;
  }
  #reiko_movie h2{
    font-size: 18px;
    margin-top: 30px;
    margin-left: 10%;
    margin-right: 10%;
  }
  .reikomovie{
    width: 80%;
    margin-top: 52px;
  }
  iframe.movie1{
    width: 94%;
  }
  #reiko_movie_text{
    margin-left: 10%;
    margin-right: 10%;
    margin-top: 53px;
    margin-bottom: 150px;
  }
}
@media (max-width:669px){
  #main_date{
    font-size: 13px;
    margin-top: 17px;
    margin-left: 5%;
    margin-right: 5%;
  }
  #reiko_movie h2{
    font-size: 18px;
    margin-top: 10px;
    margin-left: 5%;
    margin-right: 5%;
  }
  .reikomovie{
    width: 90%;
    margin-top: 24px;
  }
  iframe.movie1{
    width: 95%;
  }
  #reiko_movie_text{
    margin-left: 5%;
    margin-right: 5%;
    margin-top: 24px;
    margin-bottom: 80px;
  }
}

/*スマホ対応*/
@media (max-width:540px){
  .reikomovie{
    width: 100%;
  }
  iframe.movie1{
    width: 94%;
  }
}

/*ヘッダー背景*/
.widescreen{display: none;}
@media screen and (min-width:1100px) {
  .widescreen{
    display: block;
  }
  .middlescreen{
    display: none;
  }
  .top-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 280px; /* 背景を適用したい高さ */
    background-color: #B22437; /* ここに適用したい背景色を指定 */
    z-index: -1;
  }
}