Header code injection for featured image width?

Is there header code injection for featured image width?

As a general guideline, featured images should rarely be wider than the text of the post. Is there a way to do this by adding a header code injection?

Running version 5.22.4, on pikapods.com, with the Solo theme.

Answer (at least for Solo theme, which has a fairly narrow column of text):

Under Settings > Code injection > header

    .gh-article-image {
        max-width: 700px;
        margin: 0 auto !important;
        float: none !important;

This code should work for any theme, though you might need to experiment with the 700px, depending on your theme’s text width.