Overview
A CSS rule consists of a selector and a declaration block: The selector points to the HTML element you want to style. The declaration block contains one or more declarations separated by semicolons. Each declaration includes a CSS property name and a value, separated by a colon. Multiple CSS declarations are separated with semicolons, and declaration blocks are surrounded by curly braces.
Formula
In this example all < p > elements will be center - aligned, with a red text color:p
{
color: red;
text-align: center;
}is a selector in CSS (it points to the HTML element you want to style: <p>).
Formula
color is a property, and red is the property value text - align is a property, and center is the property valueYou will learn much more about CSS selectors and CSS properties in the next chapters!