* {
  box-sizing: border-box;
}
body {
  font-family: monospace;
  margin: 0;
  background: #cc00cc;
  color: #cc00cc;
}
a:link, a:visited {
  background-color: #66ff33;
  color: black;
  border: 2px black;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}
a:hover, a:active {
  background-color: chartreuse;
  color: white;
}
.card {
  border: 1px solid #dde4f0;
  border-radius: 12px;
  padding: 24px;
  background: #fff;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
  max-width: 420px;
}
#intro h1 {
  text-align: center; 
  font-family: monospace; 
  font-size: 300%; 
  color: plum;
}