body {
  font-family: Arial, sans-serif;
  background-image: url("bg.jpeg"); /* background image */
  background-size: cover; /* cover the entire page */
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

header {
  width: 100%;
  text-align: center;
  color: #fff;
  text-shadow: 2px 2px 4px #000;
  margin-bottom: 60px;
}

nav {
  width: 100%;
  text-align: center;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
}

nav li {
  margin: 0 10px;
}

nav a {
  text-decoration: none;
  color: #fff;
  background-color: rgba(0, 0, 0, 0.8); /* transparent black background */
  padding: 20px;
  border: none;
  border-radius: 10px;
  transition: all 0.2s ease-in-out;
  box-shadow: 2px 2px 4px #000;
  font-size: 1.2em; /* larger font size */
}

nav a:hover, nav a:active {
  background-color: #fff; /* change background color on hover */
  color: #000; /* change text color on hover */
  box-shadow: none; /* remove shadow on hover */
}

main {
  width: 80%;
  margin: 30px auto;
  text-align: center;
  color: #fff;
  text-shadow: 2px 2px 4px #000;
}

@media only screen and (max-width: 600px) {
  main {
    width: 90%;
  }
}