CTA button on hero page.

Hi there,

Try this CSS:

a.button, a.button:visited, button, input[type="submit"], a.wp-block-button__link {
    border-radius: 16px;
}

Also looking at your content, I would highly recommend using GB's grid and columns block instead of Gutenberg's columns and button blocks:
https://generateblocks.com/

It would allow you much better control overall :)

Thanks Leo. I don't have any experience in web designing. I will have to start all over again. The link is very useful. where has it been all these while? Been struggling to design my blog for a month now.
Thanks

No problem :)