16 Change Color of All Headers (Except for Textbox Headers)
Textbox header backgrounds are often dark, so this avoids changing the text color from its original, sufficiently contrastive, white. (Via the :not(.textbox__header, .section__subtitle)).
Custom Styles
h2:not(.textbox__header, .section__subtitle),
h3:not(.textbox__header, .section__subtitle),
h4:not(.textbox__header, .section__subtitle),
h5:not(.textbox__header, .section__subtitle),
body#tinymce.wp-editor h2:not(.textbox__header),
body#tinymce.wp-editor h3:not(.textbox__header),
body#tinymce.wp-editor h4:not(.textbox__header),
body#tinymce.wp-editor h5:not(.textbox__header) {
color: #0000ff
}
