/* CENTRADO VERTICAL REAL */
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;   /* vertical */
  align-items: center;       /* horizontal */
  background-color: #fdfcf9;
  color: #2b2b2b;
  font-family: "Courier New", Courier, monospace;
}

/* CONTENEDOR */
.page {
  max-width: 600px;
  width: 100%;
  text-align: center;
  padding: 40px;
}

/* MENÚ */
.menu {
  margin: 15px 0;
}

.menu a {
  text-decoration: none;
  color: #2b2b2b;
  font-weight: bold;
}

.menu a:hover {
  text-decoration: underline;
}

/* CONTENIDO */
main {
  text-align: left;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 20px;
  margin-top: 25px;
}

h3 {
  font-size: 16px;
}

ul {
  padding-left: 20px;
  list-style-type: square;
}

hr {
  width: 60%;
  margin: 30px auto;
}

footer {
  font-size: 12px;
  color: #777;
}