body {
  margin: 0;
  background-color: #ddf;
  min-height: 100vh;
}
main {
  margin-bottom: auto;
}

header {
  font-size: 1.4rem;
  text-align: center;
  margin: 10px auto;
  padding-bottom: 4px;
  border-bottom: 1px solid black;
}

h1 {
  font-size: 1.2em;
  border: double 3px #fff;
  border-radius: 0.3em;
  background-color: navy;
  color: #fff;
  padding: 0.5em;
}

p {
  text-align: justify;
  text-justify: inter-ideograph;
}

ul {
  text-align: justify;
  text-justify: inter-ideograph;
  padding-left: 1em;
}

.lightbox {
  display: none;
}
.part_line {
  position: relative;
  display: inline-block;
  font-weight: bold;
  padding: 0.25em 0.5em;
  text-decoration: none;
  border-bottom: solid 3px #668ad8;
  border-left: solid 3px #668ad8;
  color: #668ad8;
  transition: 0.4s;
}
.part_line:hover {
  padding-left: 0.7em;
  padding-right: 0.3em;
}

@media screen and (max-width: 767px) {
  .pconly {
    display: none;
  }
}
@media screen and (min-width: 768px) {
  .sponly {
    display: none;
  }
}

/* 「TOPに戻る」について */
#page-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  font-size: 80%;
}
#page-top a {
  background: #8fbc8f;
  text-decoration: none;
  color: #fff;
  width: 100px;
  padding: 25px 0;
  text-align: center;
  display: block;
  border-radius: 10px;
}
/* 「TOPに戻る」の上にカーソルが来たとき */
#page-top a:hover {
  text-decoration: none;
  background: #675233;
}

/* sticky-footer footerを一番下に固定するためのcss */
#footer {
  position: absolute;
  padding-bottom: 0.5em;
  bottom: 0;
  padding-top: 0.5em;
  width: 100%;
  font-size: 0.8em;
  background-color: #f5f5f5;
}
#footer p {
  margin: 0;
  text-align: center;
}

.featherlight-content {
  width: 80%;
}