body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header { background-color: #333; color: white; padding: 1rem; }
nav ul { list-style: none; display: flex; gap: 1rem; }
nav a { color: white; text-decoration: none; }
.grid { display: flex; flex-wrap: wrap; gap: 1rem; padding: 1rem; }
.grid-item { border: 1px solid #ccc; padding: 1rem; width: calc(33% - 2rem); }