body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f8f8;
}
header {
  background: #2b2b2b;
  color: white;
  padding: 1em;
  text-align: center;
}
nav a {
  margin: 0 10px;
  color: #ddd;
  text-decoration: none;
}
main {
  padding: 1em;
}
.banner, .carousel, .sidebar {
  background: #ccc;
  padding: 1em;
  margin-bottom: 1em;
}
footer {
  background: #2b2b2b;
  color: white;
  text-align: center;
  padding: 1em;
  position: fixed;
  width: 100%;
  bottom: 0;
}
form {
  background: #fff;
  padding: 1em;
  border: 1px solid #ccc;
}
input, textarea {
  width: 100%;
  margin-bottom: 1em;
  padding: 0.5em;
}
button {
  padding: 0.5em 1em;
}