global.css

html {
  position: relative;
  min-height: 100%;
}

body {
  background: url("bg-stars.gif");
  color: #FFA500;
  font-family: 'Times New Roman', serif;
  margin: 3em 2em;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: -1;
}

h1,
h2 {
  color: #E65C00;
}

a {
  color: #39FF14;
}

header {
  display: flex;
  flex-direction: column;
}

header #logo {
  width: 12.5em;
  border-radius: 50%;
  align-self: center;
}

header h1 {
  text-align: center;
  color: #FFFF00;
  margin: 0;
}

header marquee {
  width: 16em;
  align-self: center;
  color: #707070;
  margin-bottom: 1em;
}

header nav ul {
  display: flex;
  gap: 2em;
  justify-content: space-evenly;
  align-items: center;

  border-top: 0.1875em solid orangered;
  border-bottom: 0.1875em solid orangered;


  list-style-type: none;
  margin: 0;
  padding: 1em 0;
  text-align: center;
}

header nav ul li>a {
  text-decoration: none;
  color: inherit;
  font-weight: bold;
}


header nav ul li>a.active-nav {
  color: aquamarine;
}

header nav ul li:hover {
  color: aquamarine;
  cursor: pointer;
  text-decoration: underline;
}

main section {
  margin-top: 3em;
}

main section:nth-child(even) h2 {
  text-align: center;
}

footer {
  margin-top: 3em;
  border-top: 0.1875em solid orangered;
  color: #FF69B4;
  text-align: center;
}

@media screen and (max-width: 500px) {
  main section h2 {
    text-align: center;
  }
}