.wrapper {
  position: relative;  //横幅がウィンドウズサイズの縦幅よりもはみ出てしまう場合に、左にずらすために指定。
}
video{
  width: 100%;
  height: 100%;
}
#video {
  background-attachment: fixed; // 中央揃えになるように、fixed。
  background-position: center center; // positionも中央に。
  background-size: cover; // 画面サイズに応じてサイズを可変するように設定。
  // 以下、画面いっぱいにするためのCSS設定
  height: 100vh;
  width: 100vw;
  // z-indexは調整してください。
  z-index: 1;
}

#video::before{
  content: '';
  background-size: cover;
  background-color: #555556;
  background-image: -webkit-repeating-radial-gradient(center center, rgba(0,0,0,.2), rgba(0,0,0,.2) 1px, transparent 1px, transparent 100%);
  background-image: -moz-repeating-radial-gradient(center center, rgba(0,0,0,.2), rgba(0,0,0,.2) 1px, transparent 1px, transparent 100%);
  background-image: -ms-repeating-radial-gradient(center center, rgba(0,0,0,.2), rgba(0,0,0,.2) 1px, transparent 1px, transparent 100%);
  background-image: repeating-radial-gradient(center center, rgba(0,0,0,.2), rgba(0,0,0,.2) 1px, transparent 1px, transparent 100%);
  -webkit-background-size: 3px 3px;
  -moz-background-size: 3px 3px;
  background-size: 3px 3px;
  opacity: 0.6;/*半透明カラーの透明度*/
  position: absolute;
  top: 0px;
  left: 0px;
  right: 0px;
  bottom: 2px;
  z-index: 5;
}
.over{
  position: absolute;
  z-index: 10;
}
.flex{
  height: 100vh;
  width: 100vw;
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
}
.sp_background{
  background-image: url(../image/smp_bg.png);
  background-size: cover;
  background-position: center;
}
.play_movie{
  margin-top: 50px;
}
.play_movie img{
  width: 210px;
  height: 48px;
}
.scroll{
  display: block;
  margin: auto;
}
#footer{
  padding-top: 60px;
  padding-bottom: 60px;
  background-color: #f8f8f8;
}
#footer p{
  text-align: center;
  font-family: 'Karla', sans-serif;
}
.sp{
  display: none;
}
.pc{
  display: block;
}
@media only screen and (max-width: 640px) {
  .sp{
    display:block;
  }
  .pc{
    display: none;
  }
}