Changing margins in default theme css

Dear community, I am trying to modify styles for default theme as the margins between elements are too big.

I tried changing h3 styles in **plugins/themes/default/styles/pages/**indexSite.less, indesJournal.less, main.less from @quadruple to @base, then cleaning template cache, but nothing has changed.

Application Version -OJS 3.3.0.7

1634834920904
Theme:
Theme

Example of pages:
https://jad.noatero.ru/index.php/jad/issue/view/46
https://jad.noatero.ru/index.php/jad

Will appreciate your help.

Thank you!