.header {
  position: fixed;
  z-index: 1;
  width: 100%;
  height: 60px;
  background-color: #efefef;
}

.header__logo {
  position: absolute;
  top: 20px;
  left: 20px;
}

.header__nav-openbutton {
  position: absolute;
  top: 20px;
  right: 20px;
}

.header__nav-closebutton {
  position: absolute;
  top: 20px;
  right: 20px;
}

.header__nav-frame {
  padding: 60px 20px;
  text-align: center;
  overflow-wrap: break-word;
}

.header__nav-link:not(:last-child) {
  margin-bottom: 50px;
}

.header__nav-text {
  font-size: 18px;
  color: #7d97bf;
  text-decoration: none;
}

#about {
  padding-top: 100px;
  margin-top: -100px;
}

#concept {
  padding-top: 100px;
  margin-top: -100px;
}

#point {
  padding-top: 100px;
  margin-top: -100px;
}

#store {
  padding-top: 100px;
}

/*************************************
*         side nav contents
*************************************/
.header__nav-contents {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 1000;
  width: 180px;
  height: 100%;
  background: #fff;
  transition: 0.2s;
}

.header__nav-contents:not(.-invisible) {
  transform: translateX(0%);
}

.header__nav-contents.-invisible + .header__nav-closearea {
  display: none;
}

.header__nav-contents.-invisible {
  transform: translateX(300%);
}

.header__nav-contents:not(.-invisible) + .header__nav-closearea {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 999;
  background-color: #fff;
  opacity: 0.5;
}