body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f4f4f4;
  color: #222;
}

header {
  background-color: #1f2937;
  color: white;
  padding: 20px;
}

nav a {
  color: white;
  margin-right: 15px;
  text-decoration: none;
}

main {
  max-width: 900px;
  margin: 30px auto;
  background-color: white;
  padding: 25px;
  border-radius: 8px;
}

button {
  padding: 10px 16px;
  cursor: pointer;
}

.product {
  border: 1px solid #ccc;
  padding: 15px;
  margin-bottom: 15px;
}

input,
textarea {
  width: 100%;
  max-width: 500px;
  padding: 8px;
}