CMS that allows custom CSS/HTML
I have an issue. I have made a custom website using CSS and HTML. I want to allow my client to edit and add posts to the website without any knowledge of HTML or CSS while still giving myself the ability to manage the code. Is there any programs or online tools? I have tried wordpress at (Wordpress.org) and set it up on my website but I was unable to figure out how to use my custom HTML and CSS on the wordpress.
You can create custom sites in Wordpress by using the default installation (I think currently it's the "TwentyTwelve theme), and simply copying the files you want to customize into a child theme directory - named anything you want.
Also copy the default CSS into the child theme directory you make. These files will then be what supercedes the default files when you choose yuor child theme in the Appearance > Themes menu in the default dashboard.