Unlock Hidden Power: 6 Little-Known Ways to Master Custom Block Styles in WordPress

Once you save your code changes:

• Your new style is added to the Styles panel for that particular block. 
• The block editor shows a preview when you hover over the button.
• The Styles engine attaches the CSS class is-blue-border to the block in the editor and on the frontend.
• When opening the Global Styles via Styles → Blocks → Image, the styles can be changed by the user for the whole site. 

To organize your block style code, you can create a subfolder in the styles folder called /blocks and keep them all together. A few theme developers found they could reduce the length of their functions.php file considerably by implementing subfolders instead.

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