unless you want alot of grief, you need to chmod your wp-admin directory BACK to what it was: 755
Im going to provide a common sense lesson, in the hopes that you think before acting next time. Not to be bitchy, but because what you have done so far affects the security of your site in a most unhealthy fashion. You have to think through what you are doing, or you have to get the right answer before you act.
So lets think this through…
Your theme files are not within /wp-admin. Therefore changing the permissions of that directory or any directories within it, are NOT going to affect your theme files.
Your theme files are within wp-content/themes/
Therefore, if you are going to playing with permissions you ONLY need to mess with that directory, or better still, with JUST your themes directory.
This forum and the documentation are full of posts that explain the necessary permissions for editing themes.
Forums, and thats just one example with certain search keywords:
https://www.ads-software.com/search/editing+themes+permissions?forums=1
Docs:
https://codex.www.ads-software.com/Editing_Files
https://codex.www.ads-software.com/Editing_Files#Things_You_Need_to_Know
On permissions:
https://codex.www.ads-software.com/Changing_File_Permissions
First things first, Go and change back the permissions on your /wp-admin directory. Then go read those links. And next time, please, think. ??
