WP File Manager

Name	Action
..
block.json	Edit
editor-rtl.css	Edit
editor-rtl.min.css	Edit
editor.css	Edit
editor.min.css	Edit
style-rtl.css	Edit
style-rtl.min.css	Edit
style.css	Edit
style.min.css	Edit
theme-rtl.css	Edit
theme-rtl.min.css	Edit
theme.css	Edit
theme.min.css	Edit

Editing: style.css

.wp-block-audio{ box-sizing:border-box; } .wp-block-audio :where(figcaption){ margin-bottom:1em; margin-top:.5em; } .wp-block-audio audio{ min-width:300px; width:100%; }