ul.list-inline.nav_lang {
  right: 1rem;
  top: 2rem;
  position: fixed;
  background: rgba(255,255,255,.5);
  padding: .2rem;
  border-radius: 2px;
}

ul.list-inline.nav_lang li {
  padding-right: 10px;
  padding-left: 10px;
}

ul.list-inline.nav_lang li a {
  color: #333;
  opacity: .5;
  transition: .2s;
}

ul.list-inline.nav_lang li a:hover,
ul.list-inline.nav_lang li a:active,
ul.list-inline.nav_lang li a:focus {
  opacity: 1;
  transition: .2s;
}

ul.list-inline.nav_lang li a.selected {
  color: #333;
  opacity: 1;
  font-weight: bold;
}

ul.list-inline.nav_lang li a.selected:hover,
ul.list-inline.nav_lang li a.selected:active,
ul.list-inline.nav_lang li a.selected:focus {
  opacity: 1;
}

.header_gb {
  background: url(../images/img_gb_top.jpg) center center no-repeat;
  background-size: cover;
  display: flex;
  height: 210px;
  justify-content: center;
  align-items: center;
}

.header_gb h1 {
  font-size: 2rem;
  letter-spacing: .04rem;
}

.box_txt {
  margin: 3rem auto;
}

.box_form {
  text-align: center;
  margin: 2rem 1rem 0;
}

.btn_back_top {
  display: table;
  color: #333;
  border: 2px solid #333;
  border-radius: 0;
  padding: .6rem 2rem;
  font-size: 1rem;
  background: #fff;
  margin: 0 auto 4rem;
  transition: .2s;
}

.btn_back_top:hover,
.btn_back_top:focus {
  background: #6bcbdd;
  transition: .2s;
}

.btn_back_top:hover:active {
  background: #333;
  color: #fff;
  transition: .2s;
}

@media (max-width: 767px) {
  ul.list-inline.nav_lang {
    position: fixed;
    right: 1rem;
    top: .2rem;
  }

  ul.list-inline.nav_lang li a{
    font-size: .8rem;
  }

  .header_gb h1 {
    font-size: 1.4rem;
  }

  .header_gb {
    background: url(../images/img_gb_top_sp.jpg) center center no-repeat;
    background-size: cover;
  }

  .btn_back_top {
    margin: 1rem auto;
  }
}