body {
  background-color: #f4f4f4;
  color: #333;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6em;
  margin: 0;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
}

#main-header {
  background-color: #4078a5;
  color: #fff;
}

#navbar {
  background-color: #24435c;
  color: #fff;
}

#navbar ul {
  padding: 0;
  list-style: none;
}

#navbar li {
  display: inline;
}

#navbar a {
  color: #ddd;
  text-decoration: none;
  font-size: 16px;
  padding: 5px 15px;
}

#navbar a:hover {
  color: #fff;
  background-color: #4078a5;
  text-decoration: none;
  font-size: 16px;
  padding: 5px 15px;
  border-radius: 5px;
  transition: background-color 0.5s, color 0.5s;
}

#showcase {
  background-image: url('Moon1a.jpg');
  background-position: center right;
  min-height: 220px;
  margin-bottom: 30px;
  text-align: center;
}

#showcase h1 {
  color: #fff;
  font-size: 50px;
  line-height: 1.6em;
  padding-top: 30px;
}

#main {
  float: left;
  width: 70%;
  padding: 0 30px;
  box-sizing: border-box;
}

#main li {
  list-style: none;
}

#main a {
  color: #333;
  text-decoration: none;
  font-size: 16px;
  padding: 5px 10px;
  font-weight: bold;
}

#main a:hover {
  color: #fff;
  background-color: #4078a5;
  text-decoration: none;
  font-size: 16px;
  padding: 5px 10px;
  border-radius: 5px;
  transition: background-color 0.25s, color 0.25s;
}

#sidebar {
  float: right;
  width: 30%;
  background: #4078a5;
  color: #eee;
  font-size: 18px;
  padding: 10px 30px;
  box-sizing: border-box;
}

#main-footer {
  background: #4078a5;
  color: #fff;
  text-align: center;
  font-size: 12px;
  padding: none;
  margin-top: 30px;
}

@media (max-width: 600px) {
  #main {
    width: 100%;
    float: none;
  }

  #sidebar {
    width: 100%;
    float: none;
  }
}