How can I center a custom Salesforce html form on my webpage?

Hello - I am trying to use the web to lead from from salesforce as our contact us page. I have created the code, but for the life of me I can’t get it to be in double columns.

This is what it currently looks like:

This is what I want it to look like:

Hello @jennifertiede
Its Artzen Technologies! We will be happy to help you today.

Please send your store url

Let me know if need further assistance
Regards,
Artzen Technologies