We all have struggled with somebody else's CSS code. I am doing now, so I want to share my suggestions, observations.
There are many ways writes to write CSS code. Let me show you how to write it so everyone will instantly read it, with pleasure.
Use a name that describes what you are styling. Do not give a name "Snoopie" for a form button. Make it simple, short and above all, descriptive.
Remember about them. Some people use many values, but two spaces are just perfect.
After you write a property, it is good to leave a space before you write a value. It is much more readable, at least it is what I think.
Whatever you do, do it repeatedly. When you define your coding style, be consistent and always use the same style. Always.