I have set a specific font size in the template settings (HelixUltimate), but I see that other font sizes are being applied in the articles because there are some classes that overwrite the values I had defined (template.css).

.article-details .article-header h1,.article-details .article-header h2 {
    font-size: 2.25rem
}

Does the template level setting only apply for pages and not for articles? How should I define the size on articles? By overwriting the above class in the custom.css?

Thanks.