#header_area{
    background-image: url(../img/about_img460.png);
    background-size: cover;
    background-position: center center;
    height: 100vh;
}

/********** #header_area **/
.header_title{
  margin-top: 160px;
}
.header_title::before{
  left: 50%;
  transform: translateX(-50%);
  /* margin-left: 94px; */
}
/***** scroll-guide
******************************/
.scroll {
    position: relative;
    width: 24px;
    height: 24px;
    left: 0;
    margin: 0 auto;
  }
  
  .chevron {
    position: absolute;
    width: 28px;
    height: 8px;
    opacity: 0;
    transform: scale3d(0.5, 0.5, 0.5);
    animation: move 3s ease-out infinite;
  }
  
  .chevron:first-child {
    animation: move 3s ease-out 1s infinite;
  }
  
  .chevron:nth-child(2) {
    animation: move 3s ease-out 2s infinite;
  }
  
  .chevron:before,
  .chevron:after {
    content: ' ';
    position: absolute;
    top: 0;
    height: 100%;
    width: 51%;
    background: #fff;
  }
  
  .chevron:before {
    left: 0;
    transform: skew(0deg, 30deg);
  }
  
  .chevron:after {
    right: 0;
    width: 50%;
    transform: skew(0deg, -30deg);
  }
  
  @keyframes move {
    25% {
      opacity: 1;
  
    }
    33% {
      opacity: 1;
      transform: translateY(30px);
    }
    67% {
      opacity: 1;
      transform: translateY(40px);
    }
    100% {
      opacity: 0;
      transform: translateY(55px) scale3d(0.5, 0.5, 0.5);
    }
  }
  
  .scroll_txt {
    display: block;
    margin-top: 65px;
    margin-left: -30px;
    font-family: "Helvetica Neue", "Helvetica", Arial, sans-serif;
    font-size: 12px;
    color: #fff;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: .25;
    animation: pulse 2s linear alternate infinite;
  }
  
  @keyframes pulse {
    to {
      opacity: 1;
    }
  }

  /******************** main **/
  /****************************/
  .about_inner{
    display: flex;
    flex-direction: column;
  }
  .about_txt{
    width: 100%;
  }
  .creator_img{
    width: 50%;
  }
  .about_txt p{
    color: var(--mywhite);
    font-size: 1rem;
    margin: 1.5rem 0;
    line-height: 1.4;
    letter-spacing: 2px;
  }
  .creator_img img{
    display: block;
    width: 50%;
    height: auto;
    margin: 0 auto;
  }

  
/************************ pc **/
/******************************/
  @media (min-width:800px){

  #header_area{
    background-image: url(../img/about_img1800.jpg);
    background-size: cover;
    background-position: center center;
    height: 100vh;
}

/********** #header_area **/
.header_title{
  margin-top: 160px;
}
.header_title::before{
  left: 169px;
}
/***** scroll-guide
******************************/
.scroll {
    position: relative;
    width: 24px;
    height: 24px;
    left: 150px;
    margin: 0;
    /* transform: translateX(-50%); */
  }
  
  .chevron {
    position: absolute;
    width: 28px;
    height: 8px;
    opacity: 0;
    transform: scale3d(0.5, 0.5, 0.5);
    animation: move 3s ease-out infinite;
  }
  
  .chevron:first-child {
    animation: move 3s ease-out 1s infinite;
  }
  
  .chevron:nth-child(2) {
    animation: move 3s ease-out 2s infinite;
  }
  
  .chevron:before,
  .chevron:after {
    content: ' ';
    position: absolute;
    top: 0;
    height: 100%;
    width: 51%;
    background: #fff;
  }
  
  .chevron:before {
    left: 0;
    transform: skew(0deg, 30deg);
  }
  
  .chevron:after {
    right: 0;
    width: 50%;
    transform: skew(0deg, -30deg);
  }
  
  @keyframes move {
    25% {
      opacity: 1;
  
    }
    33% {
      opacity: 1;
      transform: translateY(30px);
    }
    67% {
      opacity: 1;
      transform: translateY(40px);
    }
    100% {
      opacity: 0;
      transform: translateY(55px) scale3d(0.5, 0.5, 0.5);
    }
  }
  
  .scroll_txt {
    display: block;
    margin-top: 65px;
    margin-left: -30px;
    font-family: "Helvetica Neue", "Helvetica", Arial, sans-serif;
    font-size: 12px;
    color: #fff;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: .25;
    animation: pulse 2s linear alternate infinite;
  }
  
  @keyframes pulse {
    to {
      opacity: 1;
    }
  }

  /******************** main **/
  /****************************/
  .about_inner{
    display: flex;
    flex-direction: row;
  }
  .about_txt,
  .creator_img{
    width: 50%;
  }
  .about_txt p{
    color: var(--mywhite);
    font-size: 1rem;
    margin: 1.5rem 0;
    line-height: 1.4;
    letter-spacing: 2px;
  }
  .creator_img img{
    display: block;
    width: 30%;
    height: auto;
    margin: 0 auto;
  }

  }