WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: Very large header, need to reduce size!, by lorro To alter the code, you’ll need to find the page template, make a child theme, copy the page template to the child theme and edit the copy. If the original template is updated, you’ll need to repeat the process. Custom css is a much less tricky method. To be able to advise it would be necessary to examine the page with browser tools. Reply To: Very large header, need to reduce size!