Always tell AI what you already have before asking it to build something new
Most beginners just say "add a contact form." AI invents its own version and breaks everything. One sentence at the start of your prompt fixes this.
What this means
When you ask AI to add something without context, it has no idea what your site already looks like. So it invents its own version — its own layout, its own style, its own structure — and drops it on top of what you had. The result is a mess. AI is not guessing badly on purpose. It just does not know what exists unless you tell it.
What to do
Start every prompt with a one-line summary of what your site currently has. For example: "My site currently has a homepage, an About page, and a navigation bar with three links. Now add a contact form that matches the existing style." That one sentence gives AI the context it needs to build something that fits — not something it imagined.
Try this prompt
My site currently has [LIST WHAT EXISTS — pages, navigation, colours, style]. Now add [WHAT YOU WANT]. Make sure it matches the existing design and does not change anything I did not mention.