body {
  font-family: Arial, sans-serif;
  margin: 30px;
  text-align: center;
}
form {
  margin: 20px auto;
  width: 300px;
  display: flex;
  flex-direction: column;
}
input, textarea {
  margin: 5px 0;
  padding: 8px;
}
button {
  background: #333;
  color: #fff;
  padding: 10px;
  border: none;
  cursor: pointer;
}
nav {
  background: #222;
  padding: 10px;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
.msg {
  text-align: left;
  background: #f4f4f4;
  padding: 10px;
  border-radius: 5px;
}