.illust {
  margin-left: auto;
  margin-right: auto;
}
.illust.illust_future {
  max-width: 425px;
}

@media (min-width: 1280px) {
  #introduction.sticky_head {
    --stickyWidth:45%;
  }
}

#naming {
  background: url("../images/about/bg_naming.jpg") no-repeat top center;
  background-size: 100% auto;
}
#naming .block .text {
  line-height: 3;
}
#naming .block .logo {
  width: 145px;
  height: 136px;
  margin: var(--space5) auto;
}
#naming .block .logo .icon {
  width: 100%;
  height: 100%;
  display: block;
  background-image: url("../images/about/logo_ecolume.png");
}
#naming .block .banner {
  max-width: 640px;
  margin: 0 auto;
}