.logo img{
  width: 100%;
}
#main {
  float: none;
  margin: 0 auto;
}
.r18 {
  color: #000;
  text-align: center;
  font-weight: bold;
  margin-top: 1em;
}
.button {
  display: -webkit-flex;
  display: flex;
  -webkit-justify-content: center;
  justify-content: center;
  text-align: center;
  -webkit-align-items: center;
  align-items: center;
  margin: 2em 0;
}
.button a {
  color: #fff;
  font-weight: bold;
  display: block;
  transition: 1.0s;
}
.button a:hover {
  color: #e6a4ff;
}
.enterbutton {
  width: 35%;
  background: #000;
  margin-right: 100px;
  font-size: 32px;
  transition: 1.0s;
}
.enterbutton:hover, .leavebutton:hover {
  box-shadow: 0px 0px 0px 3px #e6a4ff;
}
.enterbutton a {
  padding: 30px;
  letter-spacing: 4px;
}
.leavebutton {
  background: #000;
  width: 20%;
  font-size: 20px;
  transition: 1.0s;
}
.leavebutton a {
  padding: 20px;
  letter-spacing: 2px;
}
.indexbn {
  margin: 0 auto;
  text-align: center;
}

.caution {
  background: rgba(255,255,255,0.8);
  padding: 10px;
}
.caution ul{
  list-style: square;
  margin-left: 1em;
}
@media screen and (min-width: 771px) {
  .sp {
    display: none;
  }
}
@media screen and (max-width: 770px) {
  .r18 {
    font-size: 13px;
  }
  .button {
    display: block;
  }
  .enterbutton {
    width: 60%;
    margin-left: auto;
    margin-right: auto;
    font-size: 20px;
    margin-bottom: 1.5em;
  }
  .enterbutton a {
    padding: 20px;
    letter-spacing: 4px;
    box-shadow: 0px 0px 0px 2px #e6a4ff;
    color: #e6a4ff;
  }
  .leavebutton {
    width: 35%;
    margin-left: auto;
    margin-right: auto;
    font-size: 16px;
  }
  .leavebutton a {
    padding: 12px;
    letter-spacing: 2px;
  }
  .indexbn img {
    width: auto;
    max-width: 100%;
    height: auto;
  }
}