Back when CSS was allowed for journals for the first time there had been only a few deviants like ClaireJones
who provided free skins for everyone. Through the time more and more people enjoyed working on CSS skins and we also got the chance to skin our galleries.
These days, and thanks to the great resources about journal and gallery CSS that have been created, it is possible for nearly everyone to code their own skins and/or to share them with others. Still there are many people who struggle with some basic things, which is why we want to focus on some of them here.
General Where can you use CSS/HTML
On deviantART you can only use HTML and CSS on your journals, group blogs, your custom gallery folders, as well as your groups' galleries.
When you customize your profile widgets you can't add CSS or HTML like you can for journals/galleries. All you can do is using existing dA code that can be re-us