#nav {
  position: fixed;
  width: 40%;
  height: 100%;
  overflow: scroll;
  right: -40%;
  top: 0;
  background: #ffffff;
  transition: 0.7s;
  z-index: 7;
}
#nav ul {
  padding-top: 5em;
  text-align: center;
}
#nav ul li {
  font-size: 2em;
  margin-bottom: 0.5em;
  font-weight: bold;
}
#nav a {
  display: block;
  text-decoration: none;
  color: #000000;
  margin: auto;
  padding: 10px;
  font-size: 1em;
  transition: 0.5s;
}
#nav a.online-button{
  color: white;
  font-size: 1em;
}
#nav li a:hover {
  color: #d7b978;
  border-bottom: none;
}
#hamburger {
  background: #d7b978;
  padding: 1em;
  display: block;
  position: fixed;
  top: 0;
  right: 0;
  width: 5em;
  height: 5em;
  cursor: pointer;
  transition: 1s;
  text-align: center;
  z-index: 1000;
}
.nav-font1 {
  font-size: 1.25em;
}
.nav-font2 {
  font-size: 1.6em;
}
.menu {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
  color: white;
  bottom: 3.25em;
}
.inner_line {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
  width: 3em;
  height: 0.4em;
  background-color: #ffffff;
  transition: 1s;
  border-radius: 4px;
}
#line1 {
  bottom: 2.5em;
}
#line2 {
  bottom: 1.75em;
}
#line3 {
  bottom: 1em;
}
.in {
  display: block;
  transition: 0.5s;
  transform: translateX(-100%);
}
.line_1,
.line_2,
.line_3 {
  background: white;
}
.line_1 {
  transform: translateY(20px) rotate(-45deg);
  top: 0;
}
.line_2 {
  opacity: 0;
}
.line_3 {
  transform: translateY(-20px) rotate(45deg);
  bottom: 0;
}
.nav-button {
  margin: 3.5em auto 5em;
  padding: 1.5em 1.5em;
  width: 80%;
}
.menu-none {
  display: none;
}
.dark {
}
#cover {
  background: #000;
  opacity: 0.6;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 6; /* QUIZ! z-index縺ｨ縺ｯ */
  display: none; /* 騾壼ｸｸ譎ゅ〒縺ｯ髱櫁｡ｨ遉ｺ縺ｫ縺吶ｋ */
}
body.dark #cover {
  display: block; /* 繝｡繝九Η繝ｼ縺碁幕縺�※縺�ｋ縺ｨ縺阪↓縺ｯ縲∬｡ｨ遉ｺ縺吶ｋ */
}