Are there any syntax rules for CSS?

Answer 1

Yes. As there are a number of ways of setting up styles, there are some variations. Common to all is that you have to specify the selector, which is the tag you want, a property and a value. The property and value are separated by a colon. The place where you set up style will determine how it is done. In an external or internal style sheet, it would be done like this:

selector {property:value}

P {color:red}

If there is more than one rule being applied to the same tag, they are separated by a semi-colon:

P {color:red; font-size:20pt}

If it is an inline style, then they are not enclosed in braces, but are enclosed in quotation marks.

<p style="color:red">

These are just a few basic rules of syntax, but there are others and ways of doing things.