To change the style of your PDF invoices:

1. Go to Settings → "Factuurontwerp" (invoice design)
2. Click "Genereer uit huisstijl" for a design in your own brand colour, or pick one of the style presets
3. Fine-tune the accent colour, paper tint, fonts, layout and footer text; the A4 preview updates live
4. Changes save automatically and apply to all new invoices, quotes and reminders

Tip: your logo and brand colour live under Settings → "Logo en kleur"; the design studio builds on them.