If you regularly use your WordPress excerpt box, you may find its size a bit restrictive. You can alter it by altering your admin CSS file. It’s a quick fix and I’m here to walk you through it.
*Anywhere you see [WP-INSTALL], it means your WordPress installation directory.
[WP-INSTALL]/wp-admin/wp-admin.css file in a text or HTML editor (make sure to back up first) and use your Find function to find
#excerpt (Line ~361).
height: 1.8em; to whatever height you are comfortable with. Knowing my own personal writing style, I changed it to
Save the file and upload it to your
[WP-INSTALL]/wp-admin/ folder and you’re done. Login to your WordPress admin panel and click on Write to see the changes.