style.css

body, html {
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100vw;
  font-size: 0;
}

#container {
  position: relative;
  display: inline-block;
  background-color: black;
  color: white;
  text-shadow: 0 0 5px white;
  overflow: hidden; /* TODO: temporary */
}

#text {
  position: absolute;
  right: 0;
  width: 60%;
  text-align: center;
  top: 50%;
  transform: translateY(-50%);
}

#title {
  font-size: 4vw;
  font-family: 'Orbitron', sans-serif;
  text-shadow: 0 0 25px #6ebeff;
  margin-bottom: 10px;
}

#subtitle {
  font-size: 1.5vw;
  font-family: 'Julius Sans One', sans-serif;
  letter-spacing: 0.5em;
}

#menu {
  font-size: 1.5vw;
  width: 15em;
  margin: auto;
  padding: 2em 0;
  font-family: 'Play', sans-serif;
  position: relative;
}

a {
  border: 1px solid #6ebeff;
  display: block;
  text-decoration: none;
  padding: 1em 0;
  margin: 1.5em 0;
  box-shadow: 0 0 10px #6ebeff;
  cursor: pointer;
  transition: color 0.4s, box-shadow 0.4s;
}

a:hover {
  box-shadow: 0 0 15px #6ebeff, inset 0 0 10px #6ebeff;
}

a:active {
  color: lightgrey;
}

.description {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  left: 0;
  top: 2em;
  width: 100%;
}

.description ul {
  text-align: left;
  line-height: 1.8em;
  list-style-type: decimal-leading-zero;
}

.description ul ul {
  list-style-type: upper-roman;
}

.explore {
  width: 6em;
  color: white;
}

.disabled, .disabled:hover, .disabled:active {
  text-shadow: none;
  box-shadow: none;
  border-color: grey;
  color: grey;
  cursor: not-allowed;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back {
  transition: color 0.4s, text-shadow 0.4s;
}

.back:hover {
  color: lightgrey;
  text-shadow: 0 0 15px white;
  cursor: pointer;
}

#log {
  position: absolute;
  right: 0;
  bottom: 0;
  font-size: medium;
  font-family: 'Play', sans-serif;
}