body{
  background-color: white;
}


.header {
  height: 100px;
  background: #001448;
    position: relative;
}


.center-center{
  color: white;
  position: absolute;
  font-size: 45px;
  top: 50%; /*親要素を起点に上から50%*/
  left: 50%;  /*親要素を起点に左から50%*/
  transform: translateY(-50%) translateX(-50%); /*要素の大きさの半分ずつを戻す*/
  -webkit-transform: translateY(-50%) translateX(-50%);
}


.vol_no{
  font-size: 36px;
  line-height: 1.0;
}


.article_catagory{
  font-size: 28px;
  font-style: italic;
  line-height: 1.0;
}


.title{
  font-size: 36px;
  line-height: 1.2;
}


.main_text{
  font-size: 18px;
  line-height: 1.5;
}


.abstract{
  font-size: 18px;
  font-weight: normal;
  line-height: 1.0;
}


.keyword{
  font-size: 18px;
  font-weight: normal;
  line-height: 1.0;
}


.dl_pdf{
  padding: 10px 20pt;
  background-color: orangered;
  color: white;
  font-size: x-large;
  font-weight: normal;
  line-height: 1.0;
}


.dl_pdf a{
  text-decoration: none;
  color: white;
}