html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgb(240, 240, 240);
}

.content {
  max-width: 800px;
  text-align: center;
  transition: margin-top 0.5s ease;
}

.container p {
  margin: 20px 0;
}

#first-line {
  font-size: 1.6em;
  font-weight: 1000;
  color: rgb(0,0,0);
  margin-bottom: 20px;
  cursor: default;
}

#second-line {
  font-size: 2.6em;
  font-weight: 100;
  color: rgb(100,100,100);
  margin-top: 0;
}

/* Link Styles */
#second-line a {
  color: rgb(100,100,100);
  text-decoration: underline;
}

#second-line a:hover {
  text-decoration: none;
  color: rgb(90,0,255);
  font-weight: bold;
}

#second-line a:active {
  text-decoration: none;
  color: rgb(119, 0, 255);
  font-weight: lighter;
}

/* Button styles */
.button {
  display: inline-block;
  background: rgb(90, 0, 255);
  color: rgb(255,255,255);
  height: 25px;
  width: 70px;
  padding: 10px 20px;
  margin-top: 20px;
  text-decoration: none;
  font-size: 20px;
  border: 2px solid rgb(90, 0, 255);
  transition: background 0.2s, color 0.2s;
}

.button:hover {
  background: rgb(255,255,255);
  color: rgb(90, 0, 255);
}

#introduction {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  margin: 40px 100px;
  text-align: center;
  transition: opacity 0.5s ease, max-height 0.5s ease;
  color: rgb(90, 0, 255);
  font-size: 20px;
  font-weight: light;
  line-height: 1.3;
  cursor: default;
}

/* When active, introduction fades in and expands */
.show-intro #introduction {
  opacity: 1;
  max-height: 800px; /* Large enough to reveal full text */
}

/* Also move the container up when intro is shown */
.show-intro .content {
  margin-top: 30px;
}