#main_caption{
  width: 100%;
}


.pc_box{
    margin: -1591px auto 200px auto;
    position: relative;
    display: block;
    width: 980px;
    
}

.video {
  margin: 0 auto;
  position: relative;
  width: 824px;
  height: 468px;
  padding: 0;
}

.video iframe {
  display: block;
  width: 824px;
  height: 468px;
  margin: 0;
  border: 0;
}


.pc_box .btn_1,.pc_box .btn_2{
  display: inline-table;
  margin: 735px 1% 0 1%;
  padding: 0;
  width: 48%;
  vertical-align: top;
}

.pc_box .btn_1 a,.pc_box .btn_2 a{
    display: block;
    height: 120px;
    margin: 0 auto;
    padding:0;

}


#second_line{
  margin-bottom: 0;
}

#second_caption{
  width: 100%;
  margin: 0 auto;
  padding:0;
  display: block;
}
.pc_box_second{
  background-image: url(./pc_second.jpg);
  background-position: top center;
  background-repeat: no-repeat;
  background-size: 1400px;
  margin: 0 auto;
  padding:5376px 0 360px 0;
  display: block;
  width: 100%;
}
.pc_box_second .btn_3 a{
  display: block;
  margin: 0 auto;
  height: 100px;
  width: 400px;
}
.pc_box_second .btn_4,.pc_box_second .btn_5{
  display: inline-table;
  width: 460px;
  margin: 0 10px;
  padding: 0;
  margin-top: 500px;
}
.pc_box_second .btn_4 a,.pc_box_second .btn_5 a{
  display: block;
  width: 100%;
  margin: 0 auto;
  height: 120px;
}