body{
  background-size: 100vw 100vh;
  width:100%;max-width:100%;
  text-align:center; /*ページ全体を中央揃えにする*/
  background-color: rgba(213, 252, 255, 0.3);
  position: relative;
  font-family: 'Hiragino Mincho ProN','ヒラギノ明朝 ProN','Hiragino Mincho Pro','ヒラギノ明朝 Pro',serif;
  overflow-x: hidden;
  font-size: 25px;
  margin: 0;
}

.content{
  margin-bottom: 50px;
}
.top_box{
  background-image: url(sea_pic/beach_trash.jpg);
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: space-between;
  align-items: center;
  overflow-y: hidden;
  text-align: left;
}
.flex_box_yoko{
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: left;
}
.foot_list ul{
  list-style: none;
  padding: 0;
}
.one{
  margin-left: 1rem;
}
.two{
  margin-left: 2rem;
}
.pic_space{
  width: 100%;
  height: 700px;
  overflow-y: hidden;
}
.pic_space_in{
    margin-left: auto;
    margin-right: auto;
    width: 70%;
    height: 100%;
    position: relative;
}
.back_pic{
  width: 1300px;
  height: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  z-index: 20;
}
.back_pic_hide{
  width: 1300px;
  height: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  z-index: 4;
}
.title_hero{
    position: absolute;
    width: 70%;
    height: 50%;    
    position: absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    background: rgba(255, 255, 255,0.8);
    border-radius: 10%;
    z-index: 30;
    display: flex;
    align-items: center;
}
.title_hero div{
    width: 80%;
    font-size: 50px;
    font-weight: bold;
    margin-left: auto;
    margin-right: auto;
}
h2 {
    color: #6cb4e4;
    text-align: center;
    padding: 0.25em;
    border-top: solid 2px #6cb4e4;
    border-bottom: solid 2px #6cb4e4;
    background: -webkit-repeating-linear-gradient(-45deg, #f0f8ff, #f0f8ff 3px,#e9f4ff 3px, #e9f4ff 7px);
    background: repeating-linear-gradient(-45deg, #f0f8ff, #f0f8ff 3px,#e9f4ff 3px, #e9f4ff 7px);
    margin-left: 5%;
    margin-right: 5%;
}
h3{
  color: #0bd;
  text-align: left;
  font-size: 32px;
}
.answer{
  text-align: left;
  margin: 20px 20px;
}
.answer_UL{
  position: absolute;
  top: 0; left: 0;
  width: 30px;
  height: 30px;
  border-top: dashed 2px blue;
  border-left:dashed 2px blue ;
}
.answer_DR{
  position: absolute;
  bottom: 0; right: 0;
  width: 30px;
  height: 30px;
  border-bottom: dashed 2px blue;
  border-right:dashed 2px blue ;
}
.message{
  font-size: 35px;
  margin: 20px 0;
  position: relative;
}
.mark{
  left: 0;
  position: absolute;
  width: 0%;
  bottom: 0;
  transform: translate(0, -50%);
  height: 1rem;
  background: linear-gradient(transparent 60%, #6dd8ffb7 80%);
}
.wider{
  animation: wide_spread 1.2s linear 0s forwards;
}
@keyframes wide_spread {
  0%{
    width: 0;
  }
  100%{
    width: 100%;
  }
}
.under_line{
  text-decoration:underline;
}
.item-none{
    display: none;
}
.sumaho{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    font-size: 40px;
    color: rgb(0, 0, 0);
}
.flex_box{
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  width: 100%;
}
.flex_tate{
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  width: 100%;
  align-items: center;
}
.flex_tate div{
  text-align: center;
}
.flex_box_yoko{
  margin: 10px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.hide_flex{
  transform: translateY(80px);
  opacity: 0;
}
.enter_move{
  animation: enter 0.5s ease-in forwards;
}
@keyframes enter {
  0%{
    transform: translateY(80px);
    opacity: 0;
  }
  100%{
    transform: translateY(0px);
    opacity: 1;
  }
}
.pic_mini{
  overflow: hidden;
  margin: 50px 20px;
  border: 1px solid rgba(131, 131, 216,0.5);
}
.pic_size{
  margin: 0px 30px;
  width: 40%;
}
.pic_size_mini{
  width: 25%;
  margin: 0px 60px;

}
.pic_size_5 {
  width: 600px;
}
.shadow{
  box-shadow: 10px 10px #7fe2f378;
}

.pic_change{
    animation: fead_out 2.5s ease-out forwards;
}
@keyframes fead_out {
    0%{
        opacity: 1;
    }
    40%{
        opacity: 1;
    }
    100%{
        opacity: 0;
    }
}

@media screen and (max-width: 1300px){
  body{
    font-size: 20px;
  }
  .back_text{
      font-size: 55px;
  }
  .big_title{
      width: 60%;
      font-size: 22px;
  }.pic_space{
    height: 500px;
  }
  .back_pic{
    width: 900px;
  }
  .back_pic_hide{
    width: 900px;
  }
  h3{
    font-size: 28px;
  }
  .message{
    font-size: 22px;
  }
}
@media screen and (max-width: 600px){
  /* スマホの時 */
  body{
      background-color: rgba(213, 252, 255, 0.3);
      background-attachment: fixed;
      background-size: 100vw 100vh;  
      min-height: 100vh;
      width:100%;max-width:100%;
      text-align:center; /*ページ全体を中央揃えにする*/
      box-sizing:border-box;
      position: relative;
  }
  .flex_box_yoko{
    flex-direction: column;
  }
  .pic_size{
    width: 90%;
  }
  .pic_size_mini{
    width: 90%;
  }
  .message{
    font-size: 20px;
}
.title_hero{
  display: none;
}
.pic_space{
  height: 230px;
}

}
@media screen and (min-width: 601px){
  .title_phone{
    display: none;
  }
}