body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #0d0d0d;
  color: #fff;
}
header {
  text-align: center;
  padding: 2rem;
}
nav a {
  margin: 0 10px;
  color: #00bfff;
  text-decoration: none;
}
section {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
}
ul {
  list-style: square;
}
form {
  display: flex;
  flex-direction: column;
  align-items: center;
}
form input {
  padding: 10px;
  margin-bottom: 10px;
  width: 300px;
}
form button {
  background-color: #00bfff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
}
footer {
  text-align: center;
  padding: 1rem;
  background: #111;
}