Git branch workflow

my website was small enough where I usually fixed everything live on production server, including adding new features, doing bug fixes and so on.

Now, with git I can create branches in whatever order I want, and then merge them whenever I want and push things to production whenever I want. With this, comes confusion of what a good branch workflow is. And this will be my question -- in what order and from which branches to I create new branches and how do I merge them back.

Consider a specific scenario:
I am on dev server on master branch and I want to develop a specific  
feature F.
I cut a Feature branch F from master and start working on the feature.  
  Once I am done with most of the work on F and it works reasonably  
well, I want to push it to production, but .. before I do I realize  
that I want to make some CSS fixes to the site, unrelated to other  
branches, and I can wait with pushing Feature branch to Production  
until I fix up CSS reasonably well.
Here is the question:  do I cut the CSS branch from Master or do I cut  
it from the Feature branch?

If I want to keep close to my original before-git workflow, I say, either
*  merge Feature with Master
*  cut CSS branch from Master
*  do CSS fixes
*  merge CSS with Master
*  push Dev Master to Prod Master

or
*  cut CSS branch from Feature, as Feature already has latest code
*  when I am done with CSS, merge CSS into Feature
*  merge Feature into Master (and remove Feature)
*  push Dev Master to Prod Master

There are tons of other variations that are possible. Which workflow is preferred for this scenario?

Supplementary questions that may help define a good workflow for my case:
*  What if later a bug is discovered in the Feature.  If I already  
merged Feature branch into Master and deleted Feature branch, do I  
create a FeatureBugFix branch?  Or do I keep the original Feature  
branch without removing it for a while?  If so, for how long do I keep  
it?  Do I perhaps keep a general BugFix branch instead that I don't  
remove?
*  currently I am the only developer working on the code.  This will  
not change in the forseeable future.

Dennis