To change Font size, color and font family of BlockQuote in Gutenberg Editor
blockquote.wp-block-quote, blockquote, blockquote p { font-size: 23px !important; color: darkred !important; font-family: cursive !important; font-style: italic !important; text-transform: uppercase; line-height: 27px !important; }
To change header ( say h5) font size, color, italic style, uppercase and more in Gutenberg Editor
.wp-block-column h5 { font-size: 20px !important; color: darkred; font-family: cursive; text-transform: uppercase; text-align: center; font-style: italic; border-bottom: 2px solid red; }
In Single page if you want to change the Page Titl’e font size, color, uppercase , alignment in Gutenberg Editor ( applicable for single post too)
h1.entry-title { font-size: 27px; color: darkred !important; font-family: cursive !important; font-style: italic !important; text-transform: uppercase !important; text-align: center !important; }