4. CSS rule syntax

• The selector determines what elements the rule applies to.
• The property determines what aspect of the element you want to change.
• property:value pairs (declarations) are separated by semicolons.
• Case insensitive
• Newlines allowed anywhere whitespace is allowed
• Comments are written with /* ... */
• Multiple rules can apply to the same element
• e.g.:

  	/* Make all table cells have centered bold text. */
  	td { text-align: center; }
  	td { font-weight: bold; }
  
  	/* This means the same thing. */
  	td {
  	    text-align: center;
  	    font-weight: bold;
  	}