CSS selectors

The CSS element Selector
The element selector selects HTML elements based on the element name.

Example
Here, all

elements on the page will be center-aligned, with a red text color:

p {
  text-align: center;
  color: red;
}

The CSS id Selector
Theidselector uses the id attribute of an HTML element to select a specific element.

The id of an element is unique within a page, so the id selector is used to select one unique element!

Example
The CSS rule below will be applied to the HTML element with id="para1":

#para1 {
  text-align: center;
  color: red;
}

The CSS class Selector
The class selector selects HTML elements with a specific class attribute.

To select elements with a specific class, write a period (.) character, followed by the class name.

Example
In this example all HTML elements with class="center" will be red and center-aligned:

.center {
  text-align: center;
  color: red;
}

The CSS Universal Selector
The universal selector (*) selects all HTML elements on the page.

Example
The CSS rule below will affect every HTML element on the page:

* {
  text-align: center;
  color: blue;
}

The CSS Grouping Selector
The grouping selector selects all the HTML elements with the same style definitions.

Look at the following CSS code (the h1, h2, and p elements have the same style definitions):

Example
In this example we have grouped the selectors from the code above:

h1, h2, p {
  text-align: center;
  color: red;
}