html, body {
  margin: 0;
  padding: 0;
}

html {
  max-height: 100lvh;
  max-width: 100vw;
  overflow: hidden;
}
#ui,
#world {
  display: inline-flex;
  position: absolute;
  width: 100%;
  min-height: 100vh;
}

#ui button {
  width: 200px;
  height: 100px;
  font-size: 30px;
  border-radius: 10px;
  border: none;
  background: #000;
  color: #fff;
  cursor: pointer;
  font-family: 'Maplestory Bold';
}
#world {
  background: #000;
}

#promise {
  font-family: serif;
}

#presents {
  color: #fff;
  text-align: center;
  font-family: 'Pretendard', 'Nanum Gothic';
}
#presents h1 {
  font-family: 'BitBit';
}
#presents h4 {
  font-family: 'Maplestory Bold';
}
#presents h6 {
  font-family: 'Maplestory Light';
}


#universe {
  position: fixed;
  inset: 0;
  background-image: url("./space.png");
  background-size: cover;
}
#planet {
  display: inline-block;
  width: 300px;
  height: 300px;
  background-image: url("./planet.png");
}


.message {
  position: absolute;
  bottom: 10%;
  left: 50%;
  right: 50%;
}
#content {
  padding: .5em 1em;
  color: #fff;
  background: #333a;
  white-space: nowrap;
  font-family: 'Maplestory Bold', 'Pretendard', 'Nanum Gothic', sans-serif;
}

.absolute {
  position: absolute;
}
.absolute-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.my-0 {
  margin-top: 0;
  margin-bottom: 0;
}

.ease-in-out {
  transition-timing-function: ease-in-out;
}
.duration-5000 {
  transition-duration: 5s;
}
.duration-10000 {
  transition-duration: 10s;
}

@font-face{
  font-family:'BitBit';
  src: url('https://media.dfcat.net/resource/font/DNFBitBit.ttf'),
       url('https://media.dfcat.net/resource/font/DNFBitBit.otf');
}

@font-face{
  font-family: 'Maplestory Bold';
  src: url('https://media.dfcat.net/resource/font/MaplestoryBold.ttf'),
       url('https://media.dfcat.net/resource/font/MaplestoryBold.otf');
}

@font-face{
  font-family: 'Maplestory Light';
  src: url('https://media.dfcat.net/resource/font/MaplestoryLight.ttf'),
       url('https://media.dfcat.net/resource/font/MaplestoryLight.otf');
}