Remove ast-separate-container padding

ast-separate-container .ast-article-post, .ast-separate-container .ast-article-single {
    border-bottom: 1px solid var(--ast-border-color);
    margin: 0;
    padding: 5.34em 6.67em;
}

Where I can change the padding. I dont wanted to change it in style sheet.

Any option in theme custamizer. I already tried Custamize > blog > Single post > Outside and inside pading : 0

Same did for pages Custamize > page > Single page > Design padding. But nothing changed.