#header_area{
  background-image: url(../img/send_complete_img_l.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;
  /* 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;
  }
}

/***** STUDENT WORKS *****/
.page_item{
display: flex;
flex-wrap: wrap;
margin: 1rem 0;
}
.box_item{
margin: 0 3rem 3rem;
}
/************************ pc **/
/******************************/
@media (min-width: 1300px){

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

/********** #header_area **/
.header_title::before{
  top: -30px;
  left: 0;
  margin-left: 275px;
}

/***** scroll-guide
******************************/
.scroll {
    position: relative;
    width: 24px;
    height: 24px;
    left: 254px;
    margin: 0;
  }
  
  .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;
    }
  }

/***** STUDENT WORKS *****/
.page_item{
  display: flex;
  flex-wrap: wrap;
  margin: 1rem 0;
}
.box_item{
  margin: 0 3rem 3rem;
}
}