CSS syntax

Properties: A property (color, margin, font, etc.) is assigned to a selector in order to manipulate its style. Example: color: red;

Selectors

HTML elements: P { text-indent: 3em }
Class selectors: code.html { color: #191970 }
with CLASS attributes: <CODE CLASS=html> ... </CODE>
ID selectors (with ID attribute): #svp94O { text-indent: 3em }

Inheritance: Main rule: the inner selector inherits the surrounding selector's values unless otherwise modified.
Exceptions: the margin-top property is not inherited, etc.