Multicolumn adjust column width in desktop and mobile

Hi,

Please see attached screenshot, I would like to adjust column width in multicolumn section, but different width between 2 columns.

1st column make it 30%, 2nd column make it 70%

possibly call out email signup bar too in the first column, please advise?

shopify domain: https://the-blackbird-ai.myshopify.com/
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