body { font-family: sans-serif; margin: 2rem; background: #fff; color: #333; }
nav a { margin: 0 0.5rem; }
img { width: 150px; display: block; margin-bottom: 0.5rem; }
.product { margin-bottom: 2rem; }
input, select, button { margin: 0.5rem 0; padding: 0.5rem; width: 100%; max-width: 400px; }
form { max-width: 500px; }