.Irlibrary_main {
  margin: 0 0 25px;
}

.Irlibrary_main ul {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.Irlibrary_main ul li {
  width: 47%;
  padding: 7px;
  box-sizing: border-box;
  border: 1px solid #C7C7C7;
}

.Irlibrary_sub ul {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid #C7C7C7;
  border-left: 1px solid #C7C7C7;
}

.Irlibrary_sub ul li {
  width: 33.33%;
  padding: 7px;
  box-sizing: border-box;
  border-right: 1px solid #C7C7C7;
  border-bottom: 1px solid #C7C7C7;
}

#hinaMainContainer #mainInner .Irlibrary_box a {
  position: relative;
  display: block;
  padding: 9px 0;
  text-align: center;
  color: #51638D;
  font-size: 18px;
  font-weight: 600;
}

#hinaMainContainer #mainInner .Irlibrary_box a:hover {
  background: rgba(81,99,141,.75);
  color: #fff;
  text-decoration: none;
}

#hinaMainContainer #mainInner .Irlibrary_box a:hover:after {
  display: none;
}

#hinaMainContainer #mainInner .Irlibrary_box a:after {
  position: absolute;
  right: 0;
  bottom: 0;
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 11px 11px;
  border-color: transparent transparent #51638D transparent;
}

@media screen and (max-width: 639px){
  #hinaMainContainer #mainInner .Irlibrary_box a {
    font-size: 16px;
  }
  .Irlibrary_sub ul li {
    width: 50%;
  }
  .Irlibrary_main ul {
    display: block;
  }
  .Irlibrary_main ul li {
    width: 100%;
  }
  .Irlibrary_main ul li:last-child {
    border-top: 0 none;
  }
}

/* 202405追加 */
#hinaMainContainer #mainInner .Irlibrary_box a span {
  display: block;
  font-weight: 400;
  font-size: 10px;
}
#hinaMainContainer #mainInner .Irlibrary_box a {
  padding: 8px 0 5px;
}
.btn_archive {
  text-align: right;
  margin: 50px 0 80px;
} 
.btn_archive a {
  display: inline-block;
  font-size: 16px;
  color: #51638D;
  padding: 10px 30px;
  border: 1px solid #C7C7C7;
}
.btn_archive a:before {
  content: "▶︎";
  margin: 0 15px 0 0;
}
.btn_archive a:hover {
  color: #fff;
  background: #51638D;
  text-decoration: none;
}

#hinaMainContainer {
  padding: 0;
  border: 0 none;
}