Border radius on Default theme

[wmarcy]

Looking to change the border radiuses on the default 2.3.0 theme.

Any place that has a 90 degree meeting point, I would liek to add a gentle rounding to.

Any pointers would be greatly appreciated.

(I know my customizations will need to go into extra.less, but I am sort of lost at using the Development tools in the browser).
Border radius on Default theme

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